Both mikhail gorbachev and alexei sakharov were partially responsible for the fall of the soviet union.
Mikhail Sergeyevich Gorbachev is a Russian and former Soviet politician. He was the eighth and last leader of the Soviet Union. He was also General Secretary of its governing Communist Party.
Andrei Dmitrievich Sakharov was a Russian nuclear physicist, dissident, Nobel laureate, as well as activist for disarmament, peace and human rights.