In the prewar Soviet Union, Jews among other things ran the security services—they were the backbone of the NKVD, and so forth. Like the Sikhs and Gurkhas in India, Jews were a persecuted minority who could be trusted to shoot at their fellows. The commissars knew this full well and cheerfully engaged the Jews in these activities until later Stalin purged the Jews from the most important positions.

Benjamin Ginsberg (Jewish lawyer) quoted in “Q&A: Benjamin Ginsberg, the Author of ‘How the Jews Defeated Hitler’”, Tablet Mag, 2013