Soviet politician and military leader. His career began in 1918 when he joined the Cheka, the Soviet secret police. He helped to organize Moscow's defences in World War II, became a marshal of the USSR in 1947, and was minister of defence 194749 and 195355. On the fall of Georgi Malenkov he became prime minister (chair of the council of ministers) 195558 until ousted by Nikita Khrushchev.