List of leaders of the Soviet Union

During its 69-year history, the Soviet Union usually had a de facto leader who would not always necessarily be head of state or even head of government but almost always held office as Communist Party General Secretary. The office of the chairman of the Council of Ministers was comparable to a prime minister in the First World whereas the office of the chairman of the Presidium was comparable to a president.

Source: Wikipedia — List of leaders of the Soviet Union (CC BY-SA 4.0)