" Confessions were elicited by torture. The NKVD and other police organs applied the “conveyer method,” which meant uninterrupted questioning, day and night. This was complemented by the “standing method,” in which suspects were forced to stand in a line near a wall, and beaten if they touched it or fell asleep. Under time pressure to make quotas, officers often simply beat prisoners until they confessed. Stalin authorized this on 21 July 1937. In Soviet Belarus, interrogating officers would hold prisoners’ heads down in the latrine and then beat them when they tried to rise. Some interrogators carried with them draft confessions, and simply filled in the prisoner’s personal details and changed an item here or there by hand. Others simply forced prisoners to sign blank pages and then filled them in later at leisure. In this way Soviet organs “unmasked” the “enemy,” delivering his “thoughts” to the files.54 "
― Timothy Snyder , Bloodlands: Europe Between Hitler and Stalin