is a dictatorship ruled by one person

Question

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Answer 1

Not necessarily.  For example, in the former communist Soviet Union, the Communist Party ruled by dictatorship.  The party had a Chairman of the Central Committee of the Communist Party (CCCP), but it was really the Central Committee of the party that ruled, not the Chairman of the Central Committee.  The CCCP could oust the chairman, and did so with Nikita Khrushchev in the 1960s.  That was a case of rule by a small committee of people.  But in many cases, there is dictatorship in the form of rule by one person (e.g. Adolf Hitler, and some of the more extremely totalitarian communists, like Stalin and Mao, and dictators like Saddam Hussein).