Who was the leader of the USSR in the first part of the Cold War?

Nikita Khrushchev

Explanation:

Hope this helps :)

As mentioned in the question, first part of cold war. It was Joseph Stalin or simply Stalin under who the second World war ended and unfortunately the Cold war began.

He created and changed USSR (Soviet Union) into a Superpower during war of struggles in the 20th century. So, we can say that he was one of the greatest dictator of all time.

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