Joseph Vissarionovich Stalin (18 December 1878 – 5 March 1953) was a Soviet revolutionary and politician of Georgian ethnicity. Governing the Soviet Union from the mid-1920s until his death in 1953, he served as General Secretary of the Central Committee of the Communist Party of the Soviet Union from 1922 to 1952 and as Premier of the Soviet Union from 1941 to 1953. Initially heading a collective government, by 1937 he was the country's de facto dictator. Ideologically a Marxist and a Leninist, Stalin helped to formalise these ideas as Marxism–Leninism while his own policies became known as Stalinism.