Final answer:
Alexei Sakharov did not play a part in the fall of the Soviet Union.
Step-by-step explanation:
The person who did not play a part in the fall of the Soviet Union is Alexei Sakharov. The other three individuals - Nikita Khruschev, Alexander Solzhenitsyn, and Mikhail Gorbachev - each played significant roles during this time.
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