Marxism–Leninism
Marxism–Leninism (ML) is a communist theory. It was the official ideology of the Soviet Union and other socialist states. After the success of the Russian revolution in 1917 and the establishment of the Soviet Union in 1922, many communist parties around the world began to adopt Marxism–Leninism as their political line, and Marxism–Leninism was the main theoretical framework which guided multiple proletarian revolutions across the globe during the 20th century. Marxism–Leninism continues to be followed by a large portion of the international workers' movement, and is upheld by many communist parties to this day.