Joseph Stalin consolidated power in the Soviet Union following Vladimir Lenin's death in 1924. As leader, Stalin instituted radical economic policies including rapid industrialization and the collectivization of agriculture. This modernization had great success but was also extremely brutal, resulting in millions of deaths. Stalin ruled with an iron fist and purged perceived political opponents through executions and the Gulag system of forced labor camps. While Stalin cultivated a cult of personality, his totalitarian regime was criticized after his death in 1953.