During its 69-year history, the Soviet Union usually had a de facto leader who would not necessarily be head of state but would lead while holding an office such as premier or general secretary. Under the 1977 Constitution, the chairman of the Council of Ministers, or premier, was the head of government and the chairman of the Presidium of the Supreme Soviet was the head of state. 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. In the ideology of Vladimir Lenin, the head of the Soviet state was a collegiate body of the vanguard party (as described in What Is To Be Done?).