Opposition to World War II
Opposition to World War II was most vocal during the early part of World War II, and stronger still before the war started. Some communist-led organizations with links to the Comintern opposed the war during the period of the Hitler-Stalin pact but then backed it after Germany invaded the Soviet Union. However, the most popular communist organization in the US at the time, the Communist Party of the USA, firmly maintained an anti-fascist outlook on intervention throughout WWII, basing their policies on the need for a Popular Front against fascism.
In Britain, Oswald Mosley and his British Union of Fascists were opposed to war, believing that another world war against Germany was not in Britain's national interest and that Britons should "fight for Britain alone". Mosley devoted all of the party's efforts to the "Peace Campaign", calling for a referendum on the continuation of the war and advocating a negotiated peace treaty with Germany. The campaign ended after Mosley and many other senior BUF members were interned under Defence Regulation 18B in May 1940. 
Numerous US anti-Semites and anti-communists during the 1930s, notably within the Mothers' movement led by Elizabeth Dilling, also opposed World War II on the basis that it would be preferable for Nazism rather than Communism to dominate Europe. These women also wished to keep their own sons out of the combat US involvement in the war would necessitate, and believed the war would destroy Christianity and further spread atheistic Communism across Europe.
Henry Ford also opposed US participation in the war until the attack on Pearl Harbor and refused to manufacture airplanes and other war equipment for the British, whilst Father Charles Coughlin argued that “it would be better to let the Nazis conquer Britain and the Soviet Union” than to enter the war merely for the sake of Europe’s 600,000 Jews.
Pacifist opposition to World War II was limited. During the conflict, a few organisations such as the Peace Pledge Union continued their opposition to all wars. The Bruderhof, a pacifist Christian community, opted to re-locate from England to the jungles of Paraguay, rather than participate in the war effort.
Mohandas K. Gandhi's pacifist movement opposed the war even to the point of advocating that the British surrender, and that Jews offer only non-violent resistance to the Nazis. However, Gandhi still backed the use of Indian troops and territory in a pragmatic exchange for guaranteed Indian independence after the war.
The Catholic Worker Movement was also opposed to the war.
Socialists were divided in the 1930s. There was a strong element of pacifism in the socialist movement, for example in Britain's Independent Labour Party. The commitment to pacifism, however, was balanced by militant anti-fascism. During its Popular Front period, the Comintern allied with other anti-fascist parties, including right-wing parties. This policy was terminated by the Comintern when the Soviet Union signed a non-aggression pact with Hitler in August 1939.
The Communist front organizations opposed the war during the period of the Nazi-Soviet pact. Most dutifully followed orders from Moscow. In 1940, Britain's Daily Worker referred to the Allied war effort as "the Anglo-French imperialist war machine." At the same time, Joseph Stalin ordered a series of military attacks on Poland, Finland, Estonia, Latvia, Lithuania, and Romania. He used communist parties and front groups to oppose the war and military preparations to prepare for the war in other countries so the Allies (Britain and France) were less able to resist aggression and to keep the US out of the war.
In the US, organizations like the American Peace Mobilization and veterans of the Abraham Lincoln Brigade protested in opposition to the war, conscription, and the Lend-Lease Act. They said of Lend-Lease, "Roosevelt needs its dictatorial powers to further his aim of carving out of a warring world, the American Empire so long desired by the Wall Street money lords."
Communist parties around the world reversed course when Germany invaded the Soviet Union on June 22, 1941, and then advocated that material support be extended to the Soviets.
A small number of socialists (but very few Comintern members, who obeyed Moscow) continued to oppose the war. Leon Trotsky had drawn up the Proletarian Military Policy, calling for opposition to the war and support for industrial action during it. Left communists took a similar position, as did many anarchists.
A few nationalist movements in colonial countries would take no part in the conflict, which they saw as one of the colonialists' making. This was perhaps strongest in India, where some nationalists went beyond opposition to the war to form the Indian National Army and fight alongside Japanese forces. Opposition was also seen among the Ceylonese garrison on the Cocos Islands which mutinied, in part due to the influence of the Trotskyist Lanka Sama Samaja Party.
In the United States, over 125 African-Americans were imprisoned for resisting the draft or sedition, including Elijah Muhammad. Many of them were associated with the Pacific Movement of the Eastern World or the Nation of Islam and viewed the Japanese as the champions of the non-white people of the world.
Isolationism was strongest in the United States, where oceans separated it on both sides from the war fronts. Having seen their Wilsonian idealism for forgiveness for the Central Powers in World War I rejected, some Americans hoped to sit out this "Old World" war. The German-American Bund even marched down the avenues of New York City demanding isolationism. The isolationists, led by the America First Committee, were a large, vocal, and powerful challenge to President Roosevelt's efforts to enter the war. Charles Lindbergh was perhaps the most famous isolationist. Isolationism was strongest in the Midwest with its strong German-American population.
- List of peace activists
- List of anti-war organizations
- Death to the Brutes, an anti-war anarchist poster printed in France during the Second World War
- Gottlieb, Julie V. and Linehan, Thomas P. (editors); The Culture of Fascism: Visions of the Far Right in Britain (p. 67). I.B. Tauris, 2004, ISBN 978-1-86064-799-4
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- Jeansonne , Glen; Women of the Far Right: The Mothers’ Movement and World War II, pp. 10-28 ISBN 9780226395890
- Jeansonne; Women of the Far Right, p. 32
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- Volunteer for Liberty Archived 2006-12-06 at the Wayback Machine, newsletter of the Abraham Lincoln Brigade, February 1941, Volume III, No. 2