There an obvious technical error in the presentation, but this certainly has the horrible ring of truth.
In this video: The most prolific executioner of all time is a man by the name of Vasili Blokhin. Born to a Russian peasant family in 1895, as a young man he quickly earned a reputation for “chernaya rabota”, or “black work”, while serving in the Tsarist army during World War I- gaining recognition from Stalin himself for his covert assassinations, torture, and executions. Blokhin quickly rose through the ranks of Russia’s secret police at the time—the NKVD—eventually becoming the head of the Kommandatura department.