The Politburo, from 'political bureau', was the executive organization of the Communist Party of the Soviet Union.
Short for political bureau, the directing body of the Communist Party empowered to act between meetings of the full Central Committee.
Short for political bureau. The executive committee of the Central Committee of the Communist Party. The Central Committee is elected by the Party Congress, the highest body in the party.
Executive committee of the Soviet Communist party; 20 members. (p. 896)
Politburo is short for Political Bureau. The term originates either from the Russian Politicheskoye Buro, which contracts to Politburo, or from the German Politbüro. A Politburo is the executive organization for a number of political parties, most notably for Communist Parties.