Speaking of the Stasi, are you familiar with Zersetzung?
Zersetzung (German; variously translated as decomposition, corrosion, undermining, biodegradation or dissolution) is a psychological warfare technique that was first used by Nazi Germany as part of the accusation Wehrkraftzersetzung against political opponents … Decades later, during the Honecker era, the Stasi, the East German secret police used … Zersetzung to silence political opponents by repression.
The “measures of Zersetzung”, defined in the framework of a directive on police procedures in 1976, were used in the context of so-called “operational procedures” (in German Operative Vorgänge or OV). They replaced the overt terror of the Ulbricht era.
The practice of repression in Zersetzung comprised extensive and secret methods of control and psychological manipulation, including personal relationships of the target, for which the Stasi relied on its network of informal collaborators, (in German inoffizielle Mitarbeiter or IM), the State’s power over institutions, and on operational psychology. Using targeted psychological attacks the Stasi tried to deprive a dissident of any chance of a “hostile action”.
In other words, State-sponsored gaslighting of political enemies.