Under the 1977 Soviet Constitution of the Union of Soviet Socialist Republics (USSR), the Chairman of the Council of Ministers was the head of government and the Chairman of the Presidium of the Supreme Soviet was the head of state. The office of the Chairman of the Council of Ministers was the equivalent to a First World Prime Minister, while the office of the Chairman of the Presidium was equivalent to the office of the President. In the Soviet Union's seventy-year history there was no official leader of the Soviet Union offices but a Soviet leader usually led the country through the office of the Premier and/or the office of the General Secretary of the Communist Party of the Soviet Union (CPSU). In the idea of Vladimir Lenin the head of the Soviet state was a collegiate body of the vanguard party (see What is to be done?).

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 CPSU and the Soviet Government. The post of the General Secretary was abolished 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, 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.

Nikita Sergeyevich Khrushchev (April 15 [O.S. April 3] 1894, – September 11, 1971) led the Soviet Union during part of the Cold War. He served as First Secretary of the Communist Party of the Soviet Union from 1953 to 1964, and as Chairman of the Council of Ministers, or Premier, from 1958 to 1964. Khrushchev was responsible for the partial de-Stalinization of the Soviet Union, for backing the progress of the early Soviet space program, and for several relatively liberal reforms in areas of domestic policy. Khrushchev's party colleagues removed him from power in 1964, replacing him with Leonid Brezhnev as First Secretary and Alexei Kosygin as Premier.

Khrushchev was born in the Russian village of Kalinovka in 1894, close to the present-day border between Russia and Ukraine. He was employed as a metalworker in his youth, and during the Russian Civil War was a political commissar. With the help of Lazar Kaganovich, he worked his way up the Soviet hierarchy. He supported Joseph Stalin's purges, and approved thousands of arrests. In 1939, Stalin sent him to govern Ukraine, and he continued the purges there. During what was known in the Soviet Union as the Great Patriotic War (Eastern Front of World War II), Khrushchev was again a commissar, serving as an intermediary between Stalin and his generals. Khrushchev was present at the bloody defense of Stalingrad, a fact he took great pride in throughout his life. After the war, he returned to Ukraine before being recalled to Moscow as one of Stalin's close advisers.

Joseph Vissarionovich Stalin (Russian: Иосиф Виссарионович Сталин; born Iosif Vissarionovich Dzhugashvili, Russian: Иосиф Виссарионович Джугашвили; 18 December 1878 – 5 March 1953) was the Premier of the Soviet Union from 6 May 1941 to 5 March 1953. He was among the Bolshevik revolutionaries who brought about the October Revolution in Russia in 1917 and later held the position of General Secretary of the Communist Party of the Soviet Union's Central Committee from 1922 until his death in 1953. While the office of the General Secretary was officially elective and not initially regarded as the top position in the Soviet state, Stalin managed to use it to consolidate more and more power in his hands after the death of Vladimir Lenin in 1924 and gradually put down all opposition groups within the Communist Party. This included Leon Trotsky, a socialist theorist and the principal critic of Stalin among the early Soviet leaders, who was exiled from the Soviet Union in 1929. Whereas Trotsky was an exponent of permanent revolution, it was Stalin's concept of socialism in one country that became the primary focus of Soviet politics.

Yuri Vladimirovich Andropov (Russian: Ю́рий Влади́мирович Андро́пов, tr. Yuriy Vladimirovich Andropov; IPA: [ˈjʉrʲɪj vlɐˈdʲimʲɪrəvʲɪtɕ ɐnˈdropəf]; 15 June [O.S. 2 June] 1914 – 9 February 1984) was a Soviet politician and the General Secretary of the Communist Party of the Soviet Union from 12 November 1982 until his death fifteen months later.

Andropov was the son of a railway official Vladimir Konstantinovich Andropov, who was a member of a Don Cossack noble family. His mother was Yevgenia Karlovna Fleckenstein, a daughter of a wealthy Moscow businessman, Karl Franzovich Fleckenstein, a German Russian from Vyborg. Andropov was educated at the Rybinsk Water Transport Technical College.

Andropov joined the Komsomol in 1930. He became a member of the Communist Party in 1939 and was First Secretary of the Central Committee of Komsomol in the Soviet Karelo-Finnish Republic from 1940 to 1944.

During World War II, Andropov took part in partisan guerrilla activities in Finland. From 1944 onwards, he left Komsomol for Communist Party work. In 1947, he was elected Second Secretary of the Central Committee of the Communist Party of the Karelo-Finnish SSR.

Mikhail Sergeyevich Gorbachev (Russian: Михаи́л Серге́евич Горбачёв, tr. Mikhail Sergeyevich Gorbachyov; IPA: [mʲɪxɐˈil sʲɪrˈɡʲejəvʲɪtɕ ɡərbɐˈtɕof] ( listen); born 2 March 1931) is a former Soviet statesman, having served as General Secretary of the Communist Party of the Soviet Union from 1985 until 1991, and as the last head of state of the Soviet Union, having served from 1988 until its dissolution in 1991. He was the only general secretary in the history of the Soviet Union to have been born during the Communist rule.

Gorbachev was born in Stavropol Krai into a peasant Ukrainian–Russian family, and in his teens operated combine harvesters on collective farms. He graduated from Moscow State University in 1955 with a degree in law. While he was at the university, he joined the Communist Party of the Soviet Union, and soon became very active within it. In 1970, he was appointed the First Party Secretary of the Stavropol Kraikom, First Secretary to the Supreme Soviet in 1974, and appointed a member of the Politburo in 1979. Within three years of the deaths of Soviet Leaders Leonid Brezhnev, Yuri Andropov, and Konstantin Chernenko, Gorbachev was elected General Secretary by the Politburo in 1985. Before he reached the post, he had occasionally been mentioned in western newspapers as a likely next leader and a man of the younger generation at the top level.