What changes have occurred in the system of state structure of the USSR during the years of perestroika?

During the restructuring initiated by M.S. Gorbachev set a course for the democratization of the political life of the Soviet Union. Accordingly, many public organizations, movements, interest clubs, political parties appear. The Congress of People’s Deputies is established. The Supreme Council was retained, but its composition was formed from the delegates of the congress. Since 1990, the post of the President of the USSR appears, which became the same M.S. Gorbachev. The provision was removed from the Constitution according to which the CPSU was the leading and directing party. Thus, its monopoly in the political life of the country fell.