I don't think he's asserting they brought in Nazis for the fun of having them around. But it's surprising that while heightened ties to the Nazis would disqualify you from immigration eligibility, the most secretive circles of the state (and ones highly acquainted with Nazi brutality) were actively recruiting these people. Shows how deep the anti-Soviet derangement ran.
Derangement? Stalin was extremely suspicious of the west and even went so far as to accuse of us collaborating with Hitler himself. Not only that, the Soviet regime was excessively brutal. One of the worst in history despite not being mentioned much in modern history books. The treatment of captives during wartime, the Eastern Bloc in total, etc. While not a primary source "Soviet War Crimes" has a massive Wikipedia entry detailing just how bad the soviets were. At least related to WW2 alone we can look to how their treatment of the Polish was after pushing Germany out. They murdered Finnish civilians en masse during raids. Further, their deportation campaigns were enough to make most period despots blush.
To believe that anti-Soviet sentiment was "derangement" is extremely delusional.
