Marxism–Leninism is an authoritarian communist ideology which was the main communist movement throughout the 20th century. It was the state ideology of the Soviet Union, its 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 several communist parties, and remains the official ideology of the ruling parties of China, Cuba, Laos, and Vietnam as one-party socialist republics, and of Nepal in a multiparty democracy. Marxist–Leninist states are commonly referred to as "communist states" by Western academics.