Stalin implemented a command economy in the Soviet Union focused on rapid industrialization and collectivization of agriculture. Under his first Five Year Plan from 1928-1932, heavy industry and defense were prioritized through central planning while consumer goods and living standards declined. Millions joined collective farms by force and millions of wealthy peasants (kulaks) were killed or sent to labor camps, causing famine. The plan was completed ahead of schedule but collectivization failed and human costs were enormous, demonstrating Stalin's willingness to sacrifice people to transform the Soviet economy.