Look at what Stalin did to the leaders of the defense of Leningrad.
Or the returning Red Army prisoners of war, “Operation Keelhaul” is a stain on Eisenhower’s legacy.
And the 2 million Cossacks and their families in Czechoslovakia returned to the Soviets by Churchill and Truman. The smart ones committed suicide. The rest were sent back by train and disembarked in quarries and machine-gunned.
We had 24,000 POWs we were trying to get back from the Soviets after the war. They trickled some back over decades at the price of millions of dead anti-communists. In the end a great many US WWII servicemen died in Soviet gulags and mines anyways. IMO this was the cause of the Cold War. It was Stalin’s doing. He did not return our POWs and killed most returned Russians.