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.
Chairman of the Communist Party of China
Between 1922 and 1925, Chen Duxiu (still Party Secretary) served as Chairman of the Central Executive Committee (), but the name was changed in "General Secretary of the Central Executive Committee" in 1925. The post was first introduced in March 1943, when the Politburo decided to discharge Zhang Wentian as General Secretary. As his replacement, Mao Zedong, who had been the "de facto" leader of the party since the Long March, was named as Chairman of the Politburo of the CPC Central Committee (). The seventh CPC National Congress introduced the post of Chairman of the Central Committee into the party constitution, and in 1956 the General Secretary was given the day-to-day management of the Party Secretariat. The chairman was elected by the Central Committee in plenary session and had full powers over the CC, the Politburo and its Standing Committee.