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Marxism–Leninism

Marxism–Leninism is a political ideology developed by Joseph Stalin. According to its proponents, it is based on Marxism and Leninism. It describes the specific political ideology which Stalin implemented in the Communist Party of the Soviet Union and in a global scale in the Comintern. There is no definite agreement between historians about whether Stalin actually followed the principles of Marx and Lenin. It also contains aspects which according to some are deviations from Marxism such as socialism in one country. Marxism–Leninism was the official ideology of 20th-century Communist parties (including Trotskyist), and was developed after the death of Lenin; its three principles were dialectical materialism, the leading role of the Communist party through democratic centralism, and a planned economy with industrialization and agricultural collectivization. Marxism–Leninism is misleading because Marx and Lenin never sanctioned or supported the creation of an -ism after them, and is revealing because, being popularized after Lenin's death by Stalin, it contained those three doctrinal and institutionalized principles that became a model for later Soviet-type regimes; its global influence, having at its height covered at least one-third of the world's population, has made Marxist–Leninist a convenient label for the Communist bloc as a dynamic ideological order.

During the Cold War, Marxism–Leninism was the ideology of the most clearly visible communist movement and is the most prominent ideology associated with communism. Social fascism was a theory supported by the Comintern and affiliated Communist parties during the early 1930s, which held that social democracy was a variant of fascism because it stood in the way of a dictatorship of the proletariat, in addition to a shared corporatist economic model. At the time, leaders of the Comintern, such as Stalin and Rajani Palme Dutt, stated that capitalist society had entered the Third Period in which a proletariat revolution was imminent but could be prevented by social democrats and other fascist forces. The term social fascist was used pejoratively to describe social-democratic parties, anti-Comintern and progressive socialist parties and dissenters within Comintern affiliates throughout the interwar period. The social fascism theory was advocated vociferously by the Communist Party of Germany, which was largely controlled and funded by the Soviet leadership from 1928.

Within Marxism–Leninism, anti-revisionism is a position which emerged in the 1950s in opposition to the reforms and Khrushchev Thaw of Soviet leader Nikita Khrushchev. Where Khrushchev pursued an interpretation that differed from Stalin, the anti-revisionists within the international communist movement remained dedicated to Stalin's ideological legacy and criticized the Soviet Union under Khrushchev and his successors as state capitalist and social imperialist due to its hopes of achieving peace with the United States. The term Stalinism is also used to describe these positions but is often not used by its supporters who opine that Stalin practiced orthodox Marxism and Leninism. Because different political trends trace the historical roots of revisionism to different eras and leaders, there is significant disagreement today as to what constitutes anti-revisionism. Modern groups which describe themselves as anti-revisionist fall into several categories. Some uphold the works of Stalin and Mao Zedong and some the works of Stalin while rejecting Mao and universally tend to oppose Trotskyism. Others reject both Stalin and Mao, tracing their ideological roots back to Marx and Lenin. In addition, other groups uphold various less-well-known historical leaders such as Enver Hoxha, who also broke with Mao during the Sino-Albanian split. Social imperialism was a term used by Mao to criticize the Soviet Union post-Stalin. Mao stated that the Soviet Union had itself become an imperialist power while maintaining a socialist façade. Hoxha agreed with Mao in this analysis, before later using the expression to also condemn Mao's Three Worlds Theory.