Interesting to contrast the Soviet and Nazi approaches to mass murder. The Germans went for specially constructed camps and industrialised killing, the Russians just used pistols with individual executioners who really liked shooting prisoners.I'd never heard of him either, so I googled and found the Wiki page.
Chilled to the bone.
Ten hour shifts, pistol shot execution every 3 minutes in a purpose built room, floor hosed down...Next!
For 28 consecutive nights.