 In the late 1930s, Stalin's official textbook "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.The goal of Marxism–Leninism is the revolutionary transformation of a capitalist state into a socialist state by way of two-stage revolution led by a vanguard party of professional revolutionaries drawn from the proletariat.To realise the two-stage transformation of the state, the vanguard party establishes the dictatorship of the proletariat (as opposed to that of the bourgeoisie) and determines policy through democratic centralism.