The Supreme Soviet of the Georgian SSR was preceded by the All-Georgian Congress of Soviets which operated from 1922 to 1937. The Supreme Soviet was a unicameral institution and it consisted of 250 deputies (440 deputies before 1990). Deputies served five-year terms, but this was changed to four-year terms in 1978. The first multiparty elections were held on October 28, 1990, during the 1990 Georgian Supreme Soviet election. This was the first time that the Supreme Soviet of the Georgian SSR began to exercise state power. For most of its history, the Supreme Soviet of the Georgian SSR was dominated by the Communist Party of the Soviet Union and the Communist Party of Georgia.