Completed the following sentence: Following a turbulent period of democratization, dissolution of the Soviet Union and subsequent economic reform the Constitution was amended several times. <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk>
the Congress of People's Deputies and the Supreme Soviet of Russia. The referendum of 12 December 1993, which was preceded by a power struggle between the President of Russia and Russia's legislative institutions<unk> the Congress of People's Deputies and the Supreme Soviet of Russia.