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The term "Radical" (from the Latin radix meaning root) during the late 18th-century and early 19th-century identified proponents of democratic reform, in what subsequently became the parliamentary Radical Movement.
During the 19th century in the United Kingdom, continental Europe and Latin America, the term "Radical" came to denote a progressive liberal ideology inspired by the French Revolution. Historically, Radicalism emerged in an early form with the French Revolution and the similar movements it inspired in other countries. It grew prominent during the 1830s in the United Kingdom (see the Chartist Movement) and Belgium (see the Revolution of 1830), then across Europe in the 1840s-50s (see the Revolutions of 1848). In contrast to the social conservatism of existing liberal politics, Radicalism sought political support for a "radical reform" of the electoral system to widen the franchise. It was also associated with republicanism; civic nationalism; abolition of titles; rationalism and the resistance to a single established state religion; redistribution of property; and freedom of the press.
In nineteenth-century France, Radicalism had emerged as a minor political force by the 1840s, as the extreme-left of the day (in contrast to the socially-conservative liberalism of the Moderate Republicans and Orléanists monarchists, and the anti-parliamentarism of the Legitimist monarchists and Bonapartist republicans). By the 1890s the French Radicals were not organised under a single nationwide structure, but had become a significant political force in parliament; in 1901 they consolidated their efforts by forming the country's first major extra-parliamentary political party, the Republican, Radical and Radical-Socialist Party, which became the most important party of government during the second half (1899 to 1940) of the Third Republic. The success of the French PRRRS encouraged Radicals elsewhere to organise themselves into formal parties in a range of other countries in the late nineteenth and early twentieth century, with Radicals holding significant political office in Switzerland, Greece, Portugal, Italy, Spain, Denmark, Sweden, the Netherlands, Germany, Ireland, Bulgaria, Romania, and Russia. During the interwar, European Radical parties organised their own international, the Radical Entente.
As social-democracy emerged as a distinct political force in its own right, the differences that once existed between left-wing radicalism and conservative-liberalism diminished, and between 1940 and 1973 Radicalism became defunct in most of its European heartlands, its role and philosophy taken on by social-democratic and conservative-liberal parties.
Radicalism and liberalism
In some countries, Radicalism has remained only as a minor wing within the Liberal political family. Sometimes it is less doctrinaire and more moderate while other times it is more extreme.
In other countries, Radicalism and left-wing liberalism had enough electoral support, or a favourable electoral system or coalition partners, to maintain distinct Radical parties: Switzerland and Germany (Freisinn), Bulgaria, Denmark, Italy, Spain and the Netherlands, but also Argentina (Radical Civic Union), Chile and Paraguay.
Victorian era Britain possessed both trends: in England the Radicals were simply the left-wing of the Liberal coalition, though often rebelled when the coalition's socially-conservative Whigs resisted democratic reforms; whereas in Ireland Radicals lost faith in the ability of parliamentary graducalism to deliver democratic reform and, breaking away from the main body of gradualist liberal parties, pursued a radical-democratic parliamentary republic through separatist insurrection.
This does not mean that all radical parties were formed by left-wing liberals. In French political literature, it is normal to make a clear separation between Radicalism as a distinct political force to the left of Liberalism but to the right of Socialism. Over time, as new left-wing parties formed to address the new issues, the current right-wing of the Radicals would splinter off in disagreement with the majority's desire to cooperate with the new parties over the new social issues. Thus, various groups or individuals broke away from the main Radical family and became absorbed as the left-wing of the Liberal family - rather than the other way around, as in Britain and Belgium.
However, the distinction between Radicals and Liberals was made clear by the two mid-20th century attempts to create an international for centrist democratic parties. In 1923-4, the French Radicals created an Entente Internationale des Partis Radicaux et des Partis Démocratiques similaires: it was joined by the centre-left Radical parties of Europe, and in the democracies where no equivalent existed - Britain and Belgium - the Liberal party was allowed attend instead. After the Second World War the Radical International was not reformed; instead, a centre-right Liberal International was established, closer to the conservative-liberalism of the British and Belgian Liberal parties. This marked the end of Radicalism as an independent political force in Europe, though some countries such as France and Switzerland retained politically-important Radical parties well into the 1950s-1960s.
According to Encyclopædia Britannica, the first use of the word "Radical" in a political sense is generally ascribed to the English parliamentarian Charles James Fox, leader of the left-wing of the Whig party who dissented from the party's conservative-liberalism and looked favourably upon the radical reforms being undertaken by French republicans, such as universal male suffrage. In 1797, Fox declared for a "radical reform" of the electoral system. This led to a general use of the term to identify all supporting the movement for parliamentary reform.
Initially confined to the upper and middle classes, in the early 19th century "popular radicals" brought artisans and the "labouring classes" into widespread agitation in the face of harsh government repression. More respectable "philosophical radicals" followed the utilitarian philosophy of Jeremy Bentham and strongly supported parliamentary reform, but were generally hostile to the arguments and tactics of the "popular radicals". By the middle of the century, parliamentary Radicals joined with others in the Parliament of the United Kingdom to form the Liberal Party, eventually achieving reform of the electoral system.
The Radical movement had its beginnings at a time of tension between the American colonies and Great Britain, with the first Radicals, angry at the state of the House of Commons, drawing on the Leveller tradition and similarly demanding improved parliamentary representation. These earlier concepts of democratic and even egalitarian reform had emerged in the turmoil of the English Civil War and the brief establishment of the republican Commonwealth of England amongst the vague political grouping known as the Levellers, but with the English Restoration of the monarchy such ideas had been discredited. Although the Glorious Revolution of 1688 had increased parliamentary power with a constitutional monarchy and the union of the parliaments brought England and Scotland together, towards the end of the 18th century the monarch still had considerable influence over the Parliament of Great Britain which itself was dominated by the English aristocracy and by patronage. Candidates for the House of Commons stood as Whigs or Tories, but once elected formed shifting coalitions of interests rather than splitting along party lines. At general elections, the vote was restricted to property owners in constituencies which were out of date and did not reflect the growing importance of manufacturing towns or shifts of population, so that in many rotten borough seats could be bought or were controlled by rich landowners while major cities remained unrepresented. Discontent with these inequities inspired those individuals who later became known as the "Radical Whigs".
William Beckford fostered early interest in reform in the London area. The "Middlesex radicals" were led by the politician John Wilkes, an opponent of war with the colonies who started his weekly publication The North Briton in 1764 and within two years had been charged with seditious libel and expelled from the House of Commons. The Society for the Defence of the Bill of Rights which he started in 1769 to support his re-election, developed the belief that every man had the right to vote and "natural reason" enabling him to properly judge political issues. Liberty consisted in frequent elections and for the first time middle-class radicals obtained the backing of the London "mob". Middlesex and Westminster were among the few parliamentary constituencies with a large and socially diverse electorate including many artisans as well as the middle class and aristocracy and along with the county association of Yorkshire led by the Reverend Christopher Wyvill were at the forefront of reform activity. The writings of what became known as the "Radical Whigs" had an influence on the American Revolution.
Major John Cartwright also supported the colonists, even as the American Revolutionary War began and in 1776 earned the title of the "Father of Reform" when he published his pamphlet Take Your Choice! advocating annual parliaments, the secret ballot and manhood suffrage. In 1780, a draft programme of reform was drawn up by Charles James Fox and Thomas Brand Hollis and put forward by a sub-committee of the electors of Westminster. This included calls for the six points later adopted in the People's Charter (see Chartists below).
The American Revolutionary War ended in humiliating defeat of a policy which King George III had fervently advocated and in March 1782 the King was forced to appoint an administration led by his opponents which sought to curb Royal patronage. In November 1783, he took his opportunity and used his influence in the House of Lords to defeat a Bill to reform the British East India Company, dismissed the government and appointed William Pitt the Younger as his Prime Minister. Pitt had previously called for Parliament to begin to reform itself, but he did not press for long for reforms the King did not like. Proposals Pitt made in April 1785 to redistribute seats from the "rotten boroughs" to London and the counties were defeated in the House of Commons by 248 votes to 174.
In the wake of the French Revolution of 1789, Thomas Paine wrote The Rights of Man (1791) as a response to Burke's counterrevolutionary essay Reflections on the Revolution in France (1790), itself an attack on Richard Price's sermon that kicked off the so-called "pamphlet war" known as the Revolution Controversy. Mary Wollstonecraft, another supporter of Price, soon followed with A Vindication of the Rights of Woman. They encouraged mass support for democratic reform along with rejection of the monarchy, aristocracy and all forms of privilege. Different strands of the movement developed, with middle class "reformers" aiming to widen the franchise to represent commercial and industrial interests and towns without parliamentary representation, while "Popular radicals" drawn from the middle class and from artisans agitated to assert wider rights including relieving distress. The theoretical basis for electoral reform was provided by "Philosophical radicals" who followed the utilitarian philosophy of Jeremy Bentham and strongly supported parliamentary reform, but were generally hostile to the arguments and tactics of the "popular radicals".
In Ireland the United Irishmen movement took another direction, adding to the doctrine of a secular and parliamentary republic inspired by the American and French republican revolutions, another doctrine of the French Revolution, civic nationalism. Dismayed by the inability of British parliamentarianism to introduce the roor-and-branch democratic reforms desired, Irish Radicals channelled their movement into a republican form of nationalism, pursued through armed revolution and often with French assistance at various points over the late eighteenth and nineteenth centuries.
Popular Radicals were quick to go further than Paine, with Newcastle schoolmaster Thomas Spence demanding land nationalisation to redistribute wealth in a penny periodical he called Pig's Meat in a reference to Edmund Burke's phrase "swinish multitude". Radical organisations sprang up, such as the London Corresponding Society of artisans formed in January 1792 under the leadership of the shoemaker Thomas Hardy to call for the vote. One such was the Scottish Friends of the People society which in October 1793 held a British convention in Edinburgh with delegates from some of the English corresponding societies. They issued a manifesto demanding universal male suffrage with annual elections and expressing their support for the principles of the French Revolution. The numbers involved in these movements were small and most wanted reform rather than revolution, but for the first time working men were organising for political change.
The government reacted harshly, imprisoning leading Scottish radicals, temporarily suspending habeas corpus in England and passing the Seditious Meetings Act 1795 which meant that a license was needed for any meeting in a public place consisting of fifty or more people. Throughout the Napoleonic Wars, the government took extensive stern measures against feared domestic unrest. The corresponding societies ended, but some radicals continued in secret, with Irish sympathisers in particular forming secret societies to overturn the government and encourage mutinies. In 1812, Major John Cartwright formed the first Hampden Club, named after the English Civil War Parliamentary leader John Hampden, aiming to bring together middle class moderates and lower class radicals.
After the Napoleonic Wars, the Corn laws (in force between 1815 and 1846) and bad harvests fostered discontent. The publications of William Cobbett were influential and at political meetings speakers like Henry Hunt complained that only three men in a hundred had the vote. Writers like the radicals William Hone and Thomas Jonathan Wooler spread dissent with publications such as The Black Dwarf in defiance of a series of government acts to curb circulation of political literature. Radical riots in 1816 and 1817 were followed by the Peterloo massacre of 1819 publicised by Richard Carlile, who then continued to fight for press freedom from prison. The Six Acts of 1819 limited the right to demonstrate or hold public meetings. In Scotland, agitation over three years culminated in an attempted general strike and abortive workers' uprising crushed by government troops in the "Radical War" of 1820. Magistrates powers were increased to crush demonstrations by manufacturers and action by radical Luddites.
To counter the established Church of England doctrine that the aristocratic social order was divinely ordained, radicals supported Lamarckian Evolutionism, a theme proclaimed by street corner agitators as well as some established scientists such as Robert Edmund Grant.
Economic conditions improved after 1821 and the United Kingdom government made economic and criminal law improvements, abandoning policies of repression. In 1823, Jeremy Bentham co-founded the Westminster Review with James Mill as a journal for "philosophical radicals", setting out the utilitarian philosophy that right actions were to be measured in proportion to the greatest good they achieved for the greatest number. Westminster elected two radicals to Parliament during the 1820s.
The Whigs gained power and despite defeats in the House of Commons and the House of Lords the Reform Act 1832 was put through with the support of public outcry, mass meetings of "political unions" and riots in some cities. This now enfranchised the middle classes, but failed to meet radical demands. The Whigs introduced reforming measures owing much to the ideas of the philosophic radicals, abolishing slavery and in 1834 introducing Malthusian Poor Law reforms which were bitterly opposed by "popular radicals" and writers like Thomas Carlyle. Following the 1832 Reform Act, the mainly aristocratic Whigs in the House of Commons were joined by a small number of parliamentary Radicals as well as an increased number of middle class Whigs. By 1839, they were informally being called "the Liberal party".
From 1836, working class Radicals unified around the Chartist cause of electoral reform expressed in the People's Charter drawn up by six members of Parliament and six from the London Working Men's Association (associated with Owenite Utopian socialism), which called for six points: universal suffrage, equal-sized electoral districts, secret ballot, an end to property qualification for Parliament, pay for Members of Parliament and Annual Parliaments. Chartists also expressed economic grievances, but their mass demonstrations and petitions to parliament were unsuccessful.
Despite initial disagreements, after their failure their cause was taken up by the middle class Anti-Corn Law League founded by Richard Cobden and John Bright in 1839 to oppose duties on imported grain which raised the price of food and so helped landowners at the expense of ordinary people.
The parliamentary Radicals joined with the Whigs and anti-protectionist Tory Peelites to form the Liberal Party by 1859. Demand for parliamentary reform increased by 1864 with agitation from John Bright and the Reform League.
When the Liberal government led by Lord Russell and William Ewart Gladstone introduced a modest bill for parliamentary reform, it was defeated by both Tories and reform Liberals, forcing the government to resign. The Tories under Lord Derby and Benjamin Disraeli took office and the new government decided to "dish the Whigs" and "take a leap in the dark" to take the credit for the reform. As a minority government, they had to accept radical amendments and Disraeli's Reform Act 1867 almost doubled the electorate, giving the vote even to working men.
The Radicals, having been strenuous in their efforts on behalf of the working classes, earned a deeply loyal following—British trade unionists from 1874 until 1892, upon being elected to Parliament, never considered themselves to be anything other than Radicals and were labeled Lib-Lab candidates. Radical trade unionists formed the basis for what later became the Labour Party.
The territories of modern Belgium had been merged into the Kingdom of the Netherlands in 1815. Aside from various religious and socioeconomic tensions between the Dutch north and proto-Belgian south, over the 1820s a young generation of Belgians, heavily influenced by French Enlightenment ideas, had formulated criticisms of the Dutch monarchy as autocratic. The monarch enjoyed broad personal powers, his ministers were irresponsible before parliament; the separation of powers was minimal; freedom of press and association were limited; the principle of universal suffrage was undermined by the fact that theand the largely Catholic south, despite possessing two-thirds of the population, received as many seats to the Estates-General (parliament) as the smaller Protestant north; and the Dutch authorities were suspected of forcing Protestantism onto Catholics. These concerns combined to produce a pro-Catholic Radicalism distinct from both the anticlerical Radicalism of France, and the Protestant Liberalism of the Dutch north.
Following the political crisis of 1829, where the Crown Prince was named prime minister, a limited reform was introduced establishing constitutional rights, similar to the charter of rights of France's autocratic Restoration Monarchy; the Belgian Radicals, like their French counterparts, regarded such a charter of rights as insufficient, potentially revocable by a whim of the monarch. Belgian Radicals closely followed the situation in France when, on 26 July to 1 August 1930, a conservative-liberal revolution broke out, overthrowing the autocratic monarchy for a liberal constitutional monarchy. Within a month a revolt had erupted in Brussels before spreading to the rest of the Belgian provinces. After Belgian independence, the Constitution of 1831 established a constitutional monarchy and parliamentary regime, and provided a list of fundamental civil rights inspired by the French Declaration of the Right of Man.
As in Britain, Radicals in Belgium continued to operate within the Liberal Party, campaigning throughout the 19th Century for the property-restricted suffrage to be extended. This was extended a first time in 1883, and universal male suffrage was achieved in 1893 (though female suffrage would have to wait until 1919). After this Radicalism was a minor political force in Belgium, its role taken over by the emergence of a powerful social-democratic party.
During the nineteenth century, the Radicals in France were the political group of the far-left, relative to the centre-left "opportunists" (Gambetta: conservative-liberal and republican), the centre-right Orléanists (conservative-liberal and monarchist), the far-right Legitimists (anti-liberal monarchist), and the supporters of a republican military dictatorship,the Bonapartists.
Following the Napoleonic Wars and until 1848, it was technically illegal to advocate republicanism openly. Some republicans reconciled themselves to pursuing liberalism through the socially-conservative monarchy—the 'opportunists'. Those who remained intransigent in believing that the French Revolution needed to be completed through a republican regime based on parliamentary democracy and universal suffrage therefore tended to call themselves "Radicals" - a term meaning 'Purists'.
Under the Second Republic (1848–52), the Radicals, on a platform of seeking a "social and democratic republic", sat together in parliament in a group named The Mountain. When Louis-Napoléon Bonaparte launched his military coup, Radicals across France rose up in insurrection to defend the democratic republic. This experience would mark French Radicalism for the next century, prompting permanent vigilance against all those who - from Marshall Mac-Mahon to General De Gaulle - were suspected of seeking to overthrow the constitutional, parliamentary regime.
After the return to parliamentary democracy in 1871, the Radicals emerged as a significant political force: led by Georges Clemenceau, they claimed that the socially-conservative liberal republicanism of Léon Gambetta and Jules Ferry had drifted away from the ideals of the French Revolution, and that the Radicals were the true heirs to 1791. In 1881, they put forward their programme of broad social reforms: from then on, the tactic of the main Radical Party was to have 'no enemies to the left' of the Republic, allying with any group that sought social reform while accepting the legality of the parliamentary republic.
But the Radicals were not yet a political party: they sat together in parliament out of kinship, but they possessed minimal organisation outside of parliament. The first half of the Third Republic saw several events that caused them to fear a far-right takeover of parliament that might end democracy, as Louis-Napoléon had: Mac-Mahon's self-coup in 1876, the Boulangist crisis in the 1880s, the Dreyfus Affair in the 1890s. The Radicals were swept to power in 1899 and finally managed to implement their long-standing programme of reforms, such as the separation of Church and State, or the introduction of secret ballotting. In order to ensure that their legacy would remain unreversed, they set up an extraparliamentary campaign organisation to help one-another in elections: the Radical-Socialist Party, the first major modern political party in French history.
The Radical–Socialist Party was the main governmental party of the Third Republic between 1901 and 1919, and dominated government again between 1924–26, 1932–33 and 1937–40; the centre-right governments dominated by the conservative-liberal centre-right often gave a portfolio to a Radical, who would join cabinet in a personal capacity as the most left-leaning minister.
The party itself was discredited after 1940, due to fact that many (though not all) of its parliamentarians had votedto establish the Vichy regime. Under the dictatorship several prominent Radicals, such as the young left-leaning former education minister Jean Zay, and the influential editorialist Maurice Sarraut (brother to the more famous Radical party leader Albert), were assassinated by the regime's paramilitary police, while others, notably Jean Moulin, participated in the resistance movement to restore the Republic.
The Democratic and Socialist Union of the Resistance was established after World War II to combine the politics of French Radicalism with credibility derived from members' activism in the French resistance.
In the 1950s, Pierre Mendès-France attempted to rebuilt the Radical Party as an alternative to both the Christian-democratic MRP, while also leading the opposition to Gaullism which he feared to be another attempt at a right-wing coup. During this period the Radicals frequently governed as part of a coalition of centrist parties, spanning from the Socialists to the Christian-democrats.
Ultimately the installation of the Fifth Republic in 1958, and the subsequent emergence of a two-party system based on the Socialist and Gaullist movements, destroyed the niche for an autonomous Radical party. The Radical Party split into various tendencies. Its leading personality, Mendès-France himself, left in 1961 in protest at the party's acceptance of De Gaulle's military coup and joining the small social-democratic Unified Socialist Party. A decade later, a second faction advocated maintaining an alliance with the Socialist-dominated coalition of the left; it broke away in 1972 to form the Radical Party of the Left, which maintains close ties to the Socialist Party. The remainder of the original Radical Party became a de facto liberal-conservative party of the centre-right: renamed as the 'Valoisien' Radical Party, it advocated alliances with the rest of the liberal centre-right, participating first in the pro-Giscard d'Estaing Union for French Democracy (1972), then with the conservative Union for a Popular Movement (2002).
Continental Europe and Latin America
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In continental Europe and Latin America, as for instance in Italy, Spain, Chile and Argentina (Radical Civic Union), Radicalism developed as an ideology in the 19th century to indicate those who supported at least in theory a republican form of government, universal male suffrage and particularly, supported anti-clerical policies.
In German-speaking countries, this current is known as Freisinn (literally "free mind"), as in German Freeminded Party from 1884 to 1893, then Eugen Richter's Freeminded People's Party; and the Free Democratic Party of Switzerland). . However, by the twentieth century at the latest radicalism, which did not advocate particularly radical economic policies, had been overtaken as the principal ideology of the left by the growing popularity of socialism and had become an essentially centrist political movement (as far as "radicalism" survived as a distinct political ideology at all).
The 'Free-Minded' parties, located mainly in the Netherlands, Scandinavia and German-speaking countries, included:
- In Switzerland:
- In the Netherlands:
- Free-minded Democratic League, a political party in the Netherlands from 1901 to 1946
- In Germany, a succession of Radical parties existed:
- The German Free-minded Party (1884 to 1893), which split into two successors:
- the left-leaning Free-minded Union (1893 to 1910)
- and the centre-leaning the Free-minded People's Party (1893 to 1910)
- These merged as the Progressive People's Party (1910 to 1918)
- This was reformed as the German Democratic Party (1918 to 1930).
- In Scandinavia:
- In Denmark, the current Liberal Party began as a Radical Party, hence its name in Danish (Venstre, 'Left'). The Radical wing split in 1905 to form a new party, known as Radikale Venstre (Radical Left).
- In Sweden, the Free-minded National Association (1902 to 1934)
- In Norway, the Free-minded Liberal Party (1909 to 1932) and Free-minded People's Party (1932 to 1935)
- In Finland, the Free-minded League (1951 to 1965)
In Mediterranean Europe, Radical parties were often labelled 'Democratic' liberal parties:
- In Spain, Radicalism took the form of various 'democratic', 'progressive' and 'radical' parties.
- the Democratic Party (1849–69) a Spanish progressive party of Jacobin inspiration, active in the 1850s.
- the Federal Democratic Republican Party (1868-1910)
- the Democratic Radical Party (1869–80) refounded as the Progressive Democratic Party (1880-1912)
- the successor Democratic Party (1876-9) reformed as the Possibilist Democratic Party (1879–90),
- the latter's successor splinters and successors are the Progressive Republican Democratic Party
- The Radical-Republican Party (1908–40)
- The Radical-Socialist Republican Party (1928–34) and Republican Left (1934-59)
- The Republican Democratic Party and Republican Union (1934–59)
Serbia and Montenegro
Radicalism had played a pivotal role in the birth and development of parliamentarism and the construction of the modern Serbian state leading to the Yugoslavian unification. The People's Radical Party formed in 1881 was the strongest political party and was in power in the Kingdom of Serbia more than all others together. The 1888 Constitution of the Kingdom of Serbia that defined it as an independent nation and formalised parliamentary democracy was among the most advanced in the entire world due to Radical contribution and it is known as The Radical Constitution. In 1902, a crack had occurred in which the Independent Radical Party left and "the Olde" remained in the party, leading the original People's Radical Party to stray far from progressivism and into right-wing nationalism and conservatism. In the Kingdom of Yugoslavia, the Independent Radicals united with the rest of the Serbian opposition and the liberal and civic groups in the rest of the new country, forming the Yugoslav Democratic Party, while several Republican dissidents formed a Republican Party. The NRS had promoted Serb nationalism and put itself as the defender of Serb national interests. Democrats and Radicals were the dominant political parties, especially since the exclusion of the Communists.
In Montenegro, a People's Party was formed in 1907 as the country's first political party and remained the largest in the period of country's parliamentary history until the Yugoslavian unification. Later, a True People's Party was formed, which never got widespread popular support and whose bigger part had joined the original NS, but the difference was not ideological and instead was opposition and support of the Crown and sometimes in foreign relations to Serbia (the clubbists were the crown's dissidents and supporters of the people as well as Serbia as a regional power and brotherly ally—the rightists were generally anti-democratic and autocratic monarchist and also distrustful to the Serbian government's acts on the national plan).
- Cultural radicalism
- Danish Social Liberal Party (lit. The Radical Left)
- Industrial Radical Party, a fictional party in the British Empire in the novel The Difference Engine
- Italian Radicals
- Progressivism (comparison)
- Radical democracy
- Radical Party (France)
- Radical Party of the Left (France)
- Radicals (UK)
- Transnational Radical Party
- See for more information the section on Liberale und radikale Parteien in Klaus von Beyme: Parteien in westlichen Demokratien, München, 1982.
- Compare page 255 and further in the Guide to the Political Parties of South America (Pelican Books, 1973)
- Internacional Liberal|Movimento Liberal Social – Liberalismo em Portugal, Social Liberal Movement official website.
- Internationale Libérale, Europe Politique | europe-politique.eu.
- See page 1 and further of A sense of liberty by Julie Smith, published by the Liberal International in 1997.
- Hloušek, Vít; Kopeček, Lubomír (2010), Origin, Ideology and Transformation of Political Parties: East-Central and Western Europe Compared, Ashgate, p. 108
- anonymous (c. 1870). . Tonbridge.
- Davidson, John Morrison (1880). . Boston: James R. Osgood.
- British History Online – London Radicalism
- Kramnick, "English middle-class radicalism in the eighteenth century"
- London Chartism
- Public & Republic – The New English Radicals
- Radical Reformers
- Reformers – William Cobbett
- Scotland Guide – Thomas Muir (and the 1820 Radical War: extracts from Steel's Scotland's Story)
- The Transatlantic 1790s: Project: Loyalists – Radical Activities
- USA: Readers Companion to American History – Radicalism
- WWW-VL: History: US Radicalism