Secretariat of the Communist Party of the Soviet Union the CPSU, who was also a Politburo member, was the leader of the Secretariat and of the Party. Dual membership in the Secretariat and the Politburo was in practice reserved for two or three very senior members of the Soviet leadership, and in the post-Stalin era (after March 1953) was a stepping-stone to ultimate power. The last five Soviet leaders (Nikita Khrushchev, Leonid Brezhnev, Yuri Andropov, Konstantin Chernenko and Mikhail Gorbachev) were all senior Secretaries before becoming First or General Secretaries. Additionally, Georgy Malenkov was briefly reckoned as the leader of the Party for a week after Stalin's death by
Collective leadership in the Soviet Union of the collective" even after becoming Chairman of the Council of Ministers (Premier of the Soviet Union), replacing Nikolai Bulganin. Most Western observers believed that Khrushchev had become the supreme leader of the Soviet Union by the early 1960s, even if this was far from the truth. The Presidium, which had grown to resent Khrushchev's leadership style and feared Mao Zedong's one-man dominance and the growing cult of personality in the People's Republic of China, began an aggressive campaign against Khrushchev in 1963. This campaign culminated in 1964 with the replacement of Khrushchev in his offices of First Secretary by