The Congress of People 's Deputies of the Soviet Union was created as part of Mikhail Gorbachev 's reform agenda .
The Congress of People 's Deputies of the Soviet Union was was enabled by Gorbachev 's first constitutional change .
The Congress of People 's Deputies of the Soviet Union was created as part of Mikhail Gorbachev 's reform agenda , and was enabled by Gorbachev 's first constitutional change .