List of leaders of the Soviet Union
Following Joseph Stalin's consolidation of power in the 1920s, the post of the General Secretary of the Central Committee of the Communist Party became synonymous with leader of the Soviet Union, because the post controlled both the Communist Party and the Soviet Government, both indirectly, via Party membership, and via the tradition of a single person holding two highest posts: in the Party and in the government. The post of the General Secretary was abolished in 1952 under Stalin and later re-established by Nikita Khrushchev under the name of First Secretary. In 1966, Leonid Brezhnev reverted the office title to its former name. Being the head of the Communist Party of the Soviet Union (CPSU), the office of the General Secretary was the highest in the Soviet Union until 1990. The post of General Secretary lacked clear guidelines of succession, so after the death or removal of a Soviet leader the successor usually needed the support of the Politburo, the Central Committee, or another government or party apparatus to both take and stay in power. The President of the Soviet Union, an office created in March 1990, replaced the General Secretary as the highest Soviet political office.
Soviet Union
The Communist Party maintained its dominance over the state largely through its control over the system of appointments. All senior government officials and most deputies of the Supreme Soviet were members of the CPSU. Of the party heads themselves, Stalin in 1941–1953 and Khrushchev in 1958–1964 were Premiers. Upon the forced retirement of Khrushchev, the party leader was prohibited from this kind of double membership, but the later General Secretaries for at least some part of their tenure occupied the largely ceremonial position of Chairman of the Presidium of the Supreme Soviet, the nominal head of state. The institutions at lower levels were overseen and at times supplanted by primary party organizations.