Premier of the Soviet Union
The Premier of the Soviet Union (Russian: Глава Правительства СССР) was the head of government of the Union of Soviet Socialist Republics (USSR). From 1923 to 1946, the name of the office was Chairman of the Council of People's Commissars, and from 1946 to 1991 its name was Chairman of the Council of Ministers.
Source: Wikipedia — Premier of the Soviet Union (CC BY-SA 4.0)