Stasi
The Ministry for State Security (German: Ministerium für Staatssicherheit, pronounced [minɪsˈteːʁiʊm fyːɐ̯ ˈʃtaːtsˌzɪçɐhaɪt]; abbreviated MfS), commonly known as the Stasi (pronounced [ˈʃtaːziː] , an abbreviation of Staatssicherheit), was the intelligence service and secret police of East Germany (the German Democratic Republic or GDR) from 1950 to 1990. It was one of the most repressive police organisations in the world, infiltrating almost every aspect of life in East Germany, using torture, intimidation, and a vast network of informants to crush dissent.