Stalinism refers to the political methodology implemented during the rule of Joseph Stalin. Stalin was sole ruler of the USSR from 1929 until his death in 1953. Policies during his time as leader saw the Soviet Union transformed from being a peasant based society into an Industrial giant. Investment in heavy industry, Collectivisation of Agriculture and a Cult of Personality were among the main features of Stalinism in the Soviet Union. His political belief also saw the concept of Socialism in one country emerge and the enforcement of the notion that all foreign communist governments were subservient to the Soviet Union.