Zersetzung (wikipedia.org)
Zersetzung (pronounced [t͡sɛɐ̯ˈzɛt͡sʊŋ] ⓘ, German for "decomposition" and "disruption") was a psychological warfare technique used by the Ministry for State Security (Stasi) to repress political opponents in East Germany during the 1970s and 1980s.