Mikhail Andreyevich Suslov (Russian: Михаи́л Андре́евич Су́слов; 21 November [O.S. 8 November] 1902 – 25 January 1982) was a Soviet statesman during the Cold War. He served as Second Secretary of the Communist Party of the Soviet Union from 1965, and as unofficial Chief Ideologue of the Party until his death in 1982. Suslov was responsible for party democracy and the separation of power within the Communist Party. His hardline attitude toward change made him one of the foremost anti-reformist Soviet leaders, bringing him into conflict with Nikita Khrushchev during the latter's term. He was seen as a Leonid Brezhnev's second-in-command, despite his opposition to the one-person rule Brezhnev successfully re-established.
Suslov died on 25 January 1982. His death kicked off the battle within the party to determine who would eventually succeed Brezhnev. Brezhnev himself died on 10 November 1982.
When Molotov stated that Mikhail Suslov could not have reasoned more trenchantly, Stalin allowed that Suslov had played a role in developing the theory, although the main thrust was Stalin's. Molotov doubted this privately, but did not press the issue.