According to the Constitution, as amended in 1988, the highest legislative body in the Soviet Union was the Congress of People's Deputies, which convened for the first time in May 1989. The main tasks of the congress were the election of the standing legislature, the Supreme Soviet, and the election of the chairman of the Supreme Soviet, who acted as head of state. Theoretically, the Congress of People's Deputies and the Supreme Soviet wielded enormous legislative power. In practice... the Congress of People's Deputies met infrequently and only to approve decisions made by the party, the Council of Ministers, and its own Supreme Soviet. The Supreme Soviet, the Presidium of the Supreme Soviet, the chairman of the Supreme Soviet, and the Council of Ministers had substantial authority to enact laws, decrees, resolutions, and orders binding on the population. The Congress of People's Deputies had the authority to ratify these decisions.