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.
Chen Duxiu
At the First Congress of the Communist Party in Shanghai, Chen was elected (in absentia) as the party's first General Secretary; and, with the assistance of Li Dazhao, he developed what would become a crucial cooperative relationship with the International Communist Movement, the Comintern. This cooperation with the Comintern would later prove to be a problem for the fledgling CPC over the next decade, as aggressive foreign Comintern advisors would try to force policy according to the wishes of Moscow and against the will of many prominent CPC leaders, often for the national interest of the USSR. By 1922, the size of the entire Communist Party in China was only about 200 members, not counting those overseas. Chen remained as the undisputed leader of the Chinese Communist Party until 1927, and was often referred to as "China's Lenin" during this period.