politburo; political bureau
Refers specifically to the top decision-making body of a communist party, such as the Chinese Communist Party's Politburo.
中国共産党の政治局は重要な政策を決定する。
The Politburo of the Chinese Communist Party decides important policies.
Compound of 政治 (politics) and 局 (bureau, office). The term is a calque from Russian politbyuro, used in the context of communist party structures.