Yegor Kuzmich Ligachyov was a Soviet and Russian politician who was a high-ranking official in the Communist Party of the Soviet Union (CPSU), and who continued an active political career in post-Soviet Russia. Originally an ally of Mikhail Gorbachev, Ligachyov became a challenger to his leadership.

The Communist Party of the Soviet Union (CPSU), at some points known as the Russian Communist Party, All-Union Communist Party and Bolshevik Party, and sometimes referred to as the Soviet Communist Party (SCP), was the founding and ruling political party of the Soviet Union. The CPSU was the sole governing party of the Soviet Union until 1990 when the Congress of People's Deputies modified Article 6 of the 1977 Soviet Constitution, which had previously granted the CPSU a monopoly over the political system. The party's main ideology was Marxism–Leninism.