Its initial full name was the "Congress of Soviets of Workers', Soldiers' and Peasants' Deputies".
In theory, it was the supreme power of the Soviet State, an organ of the dictatorship of the proletariat.
Officially, the Congress of Soviets created laws and elected the Council of People's Commissars, which was the government.
[1] By the time of Lenin's death in 1924 the Congress of Soviets effectively only rubber-stamped the decisions of the Communist Party and served as a propaganda tribune.
During this time the Central Committee of the AUCP(b) held de facto control over the government.