Within the Marxist movement, the word revisionism is used to refer to various ideas, principles and theories that are based on a significant revision of fundamental Marxist premises. The term is most often used by those Marxists who believe that such revisions are unwarranted and represent a "watering down" or abandonment of Marxism. As such, revisionism often carries pejorative connotations. Those identified as "revisionists" have criticized "orthodox" Marxism for having disregarded Marx's view of the necessity of evolution of capitalism to achieve socialism by replacing it with an "either/or" dynamic between capitalism and socialism; for disregarding Marx's emphasis on the role of parliamentary democracy in achieving socialism; as well as criticizing Karl Kautsky for his idea of state socialism.
The term "revisionism" has been used in a number of different contexts to refer to a number of different revisions (or claimed revisions) of Marxist theory:
In the late 19th century, revisionism was used to describe democratic socialist writers such as Eduard Bernstein and Jean Jaurès, who sought to revise Karl Marx's ideas about the transition to socialism and claimed that a revolution through force was not necessary to achieve a socialist society. The views of Bernstein and Jaurès gave rise to reformist theory, which asserts that socialism can be achieved through gradual peaceful reforms from within a capitalist system.
In the 1920s and 1930s, the International Left Opposition led by Leon Trotsky, which had been expelled from the Communist International, accused the leadership of the Comintern and Soviet Union of revising the internationalist principles of Marxism and Leninism in favor of the aspirations of an elite bureaucratic caste which had come to power in the Soviet Union. The Trotskyists saw the nascent Stalinistbureaucracy as a roadblock on the proletariat's path to world socialist revolution, and to the shifting policies of the Comintern, they counterposed the Marxist theory of Permanent Revolution. The Soviet authorities, meanwhile, labeled the Trotskyists as "revisionists" and eventually expelled them from the Communist Party of the Soviet Union, whereupon the Trotskyists founded their Fourth International.
In the 1940s and 1950s within the international communist movement, revisionism was a term used by Stalinists to describe communists who focused on consumer goods production instead of heavy industry; accepted national differences instead of promoting proletarian internationalism; and encouraged liberal reforms instead of remaining faithful to established doctrine. Revisionism was also one of the charges leveled at Titoists as punishment for their pursuance of a relatively independent form of communist ideology, amidst a series of post-World War 2 purges beginning in 1949 in Eastern Europe by the Soviet administration under Stalin. After Stalin's death a more participatory, more democratic form of socialism became briefly acceptable in Hungary during Imre Nagy's government (1953-1955) and in Poland during Władysław Gomułka's government, containing ideas that the rest of the Soviet bloc, and the Soviet Union itself, variously considered revisionist, although neither Nagy nor Gomułka described themselves as revisionists, since to do so would have been self-deprecating.
Following the 1956 Secret Speech that denounced Stalin, many communist activists, astounded and disheartened by what they saw as the betrayal of Marxist-Leninist principles by the very people who had founded them, resigned from western communist parties in protest. These quitters were sometimes accused of revisionism by those communists who remained in these parties, although some of these same loyalists also shortly thereafter split from the same communist parties in the 1960s to become the New Left "anti-revisionists", indicating that they, too, were disillusioned by the actions of the Soviet Union by that point in time. Most of those who left in the sixties started aligning themselves closely with Mao Zedong as opposed to the Soviet Union. E. P. Thompson's New Reasoner was an example.
^Oxford English Dictionary Revisionism 1. "A policy first put forward in the 1890s by Edward Bernstein (1850-1932) advocating the introduction of socialism through evolution rather than revolution, in opposition to the orthodox view of Marxists; hence a term of abuse used within the communist world for an interpretation of Marxism which is felt to threaten the canonical policy." with the first use in English "1903 Social-Democrat VII. 84 (heading) Revisionism in Germany."
^Michael Harrington. Socialism: Past and Future. Reprint edition of original published in 1989. New York, New York, USA: Arcade Publishing, 2011. Pp. 43-59.