The Union of Social Socialist Republics was created in 1922 and it was formed by 11 republics but later other 4 were added so the 15 republics were: Armenia, Azerbaijan, Belarus, Estonia, Georgia, Kazakhistan, Kyrgyzstan, Latvia, Lithuania, Moldova, Russia, Tajikistan, Turkemistan,Ukranie and Uzbekistan.
Paqui has also explained us that the USSR was a totalitarian state in which there was only one party which was the Communist Party of the Soviet Union which was considered to be the representative of the proletariat. This party helds the power of the three institutions of the government. Those who oposed the government were persecuted and punished.
People could choose one of these options, to vote the representative of the camber of the Soviet of the Union or the Soviet of the Nationalities, both of them belonged to the Comunist Party.