Joseph Stalin, a Georgian revolutionary, led the Soviet Union from 1924 until his death in 1953, consolidating power to become a dictator after initially governing with a collective leadership. His ideology, known as stalinism, was tied to the doctrine of 'socialism in one country,' which justified industrialization and collectivization while appealing to Russian nationalism. Stalin's rise to power involved a complex series of strategic maneuvers, leveraging his position as general secretary and the party's structures, amidst a rivalry with Leon Trotsky following Lenin's death.