The East German Stasi used psych warfare called Zersetzung against dissidents. Tactics involved breaking into homes and subtly manipulating the contents; moving furniture, altering alarms, removing pictures from walls. Many thought they were losing their minds, and had mental breakdowns.
Zersetzung This article is about the Stasi psychological warfare technique. For the Nazi Germany crime of undermining the war effort, see Wehrkraftzersetzung. Directive No. 1/76 on the Development and Revision of Operational Procedures, which outlined the use of Zersetzung in the Ministry for State Security. Zersetzung (German for “decomposition”) is a psychological warfare technique used […]