Final answer:
Joseph Stalin succeeded Vladimir Lenin as the leader of the Soviet Union and implemented transformative policies during his rule.
Explanation:
Joseph Stalin succeeded Vladimir Lenin and became the leader of the Soviet Union after Lenin's death in 1924. Stalin ruled the USSR until his death in 1953, shaping the country with policies like rapid industrialization, collectivization of farms, and the Great Purge.
Stalin's leadership was marked by authoritarianism and a strong centralized control over the Soviet Union, leading to significant socio-political changes during his tenure.
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