Marxism–Leninism is a communist ideology that became the largest faction of the communist movement in the world in the years following the October Revolution. It was the predominant ideology of most socialist governments throughout the 20th century. Developed in Russia by the Bolsheviks, it was the state ideology of the Soviet Union, Soviet satellite states in the Eastern Bloc, and various countries in the Non-Aligned Movement and Third World during the Cold War, as well as the Communist International after Bolshevisation. Today, Marxism–Leninism is the ideology of the ruling parties of China, Cuba, Laos and Vietnam (all one-party socialist republics), as well as many other Communist parties. The state ideology of North Korea is derived from Marxism–Leninism (although its evolution is disputed). Marxist–Leninist states are commonly referred to as "communist states" by Western academics. Marxist–Leninists reject anarchism and left communism, as well as reformist socialism and social democracy. They oppose fascism and liberal democracy, and are self-proclaimed anti-imperialists. Marxism–Leninism holds that a two-stage communist revolution is needed to replace capitalism. A vanguard party, organized through democratic centralism, would seize power on behalf of the proletariat and establish a one-party socialist state, called the dictatorship of the proletariat. The state would control the means of production, suppress opposition, counter-revolution, and the bourgeoisie, and promote Soviet collectivism, to pave the way for an eventual communist society that would be classless and stateless.
Marxism–Leninism was developed from Bolshevism by Joseph Stalin in the 1920s based on his understanding and synthesis of orthodox Marxism and Leninism. After the death of Vladimir Lenin in 1924, Marxism–Leninism became a distinct movement in the Soviet Union when Stalin and his supporters gained control of the party. It rejected the common notion among Western Marxists of world revolution as a prerequisite for building socialism, in favour of the concept of socialism in one country.