How many Soviet people are believed to have been killed by Stalin's government during the years 1937 and 1938? What was Richard Pipes's source?

This was discoverde by Germans when they fought at stalingrad

Explanation: According to official figures there were 777,975 judicial executions for political charges from 1929–53, including 681,692 in 1937–38, the years of the Great Purge[8] Unofficial estimates estimate a total number of Stalinism repression deaths in 1937–38 at 950,000–1,200,000.

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