When was Marxism-Leninism instated in the Soviet Union?
Marxism–Leninism
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In the late 1920s, after the death of Lenin, Stalin established universal ideologic orthodoxy in the Communist Party, the USSR, and the Communist International, with his coinage Marxism–Leninism, a term which redefined theories of Lenin and Marx to establish universal Marxist–Leninist praxis for the exclusive, geopolitical benefit of the USSR.[6][7] In the late 1930s, Stalin's official textbook The History of the Communist Party of the Soviet Union (Bolsheviks) (1938), made the term Marxism–Leninism common, political-science usage among communists and non-communists.[8]