Government of the Soviet Union
Communist states can be ruled "de facto" by the Politburo, such as the Politburo of the Communist Party of the Soviet Union. This is an organ of the Communist Party and not a state organ, but due to one-party rule, the state and its cabinet (e.g. Government of the Soviet Union) are in practice subordinate to the Politburo. Technically a Politburo is overseen and its members selected by the Central Committee, but in practice it was often the other way around: powerful members of the Politburo would ensure their support in the Central Committee through patronage. In China, political power has been further centralized into a standing committee of the Politburo.