No one allowed it to happen. They took over during the Russian revolution.
There were some violent revolutions in Europe during the 19th and 20th centuries, such as the Russian Revolution and the French Revolution. While they were not exactly as Karl Marx predicted, they did result in significant social and political changes. Marx's theories did influence some revolutionary movements, but the outcomes were shaped by various factors beyond his predictions.
The cast of Revolutions Happen Like Refrains in a Song - 1987 includes: Reynaldo Villarma
Great Retreat - Russian - happened in 1915.
Russian invasion of Manchuria happened in 1900.
Russian Music Competition happened in 2002.
Russian apartment bombings happened in 1999.
Many revolutions happened in this period. The Russian revolution, Communist revolutions in Bavaria and Hungary, Peasants in Spain started to take land, and India was challenging English rule. An Allied expeditionary force tried to help fight against Lenin in 1919. On the home front 4 million people altogether in 1919 engaged in labor strikes. Meanwhile when the war ended and Allied Leaders met to discuss what would happen with Europe and the defeated powers. The Versailles treaty
No, the two Russian Revolutions of 1917 did not lead to Moscow being renamed anything, much less Leningrad. Moscow has, since it's founding ,and still is, 'Moscow.' The city of Petrograd (formerly known as St. Petersburg), however, was renamed Leningrad in 1924 in honor of Vladimir Lenin who had died in that year. It did not happen immediately after the Revolutions. Leningrad has now had its name changed one more time back to St. Petersburg after the breakup of the Soviet Union.
Russian Conquest of Bukhara happened on -1868-05-20.
Abduction of Russian diplomats in Iraq happened in 2006.
Saint Petersburg, it was the capital city of the Russian Empire until 1918.