What name was the city of st. petersburg renamed a second time?

The city was renamed Petrograd in 1914, at the beginning of World War I, because it sounded less German, was then named Leningrad after the death of Vladimir Lenin in 1924, and again became St. Petersburg in 1991 when the Soviet Union collapsed.

The question of what caused the full effects of the radical stage, also called the second french revolution by some historians, which shook the political and social reforms in france have caught the attention of many scholars, particularly because of principles implemented during this stage which is contradictory to the fundamental principle of the french revolution itself, by using dictatorship to create equality.