What was Joseph Stalin most famous policy?

Joseph Stalin is most famous for his policy of collectivization, which aimed to consolidate individual landholdings and labor into collective farms in the Soviet Union. This policy sought to increase agricultural productivity and support rapid industrialization but resulted in widespread famine, particularly the Holodomor in Ukraine, and significant suffering for millions of peasants. Additionally, Stalin's Five-Year Plans, which focused on industrial growth and modernization, were another key aspect of his leadership. Together, these policies had profound and often devastating impacts on Soviet society and the economy.