The Ministry for State Security (German: Ministerium für Staatssicherheit, pronounced [minɪsˈteːʁiʊm fyːɐ̯ ˈʃtaːtsˌzɪçɐhaɪ̯t]; abbreviated MfS), commonly known as the Stasi (pronounced [ˈʃtaːziː] , an abbreviation of Staatssicherheit), was the state security service and secret police of East Germany from 1950 to 1990.
The function of the Stasi in East Germany (the GDR) resembled that of the KGB in the Soviet Union, in that it served to maintain state authority and the position of the ruling party, in this case the Socialist Unity Party of Germany (SED). This was accomplished primarily through the use of a network of civilian informants who contributed to the arrest of approximately 250,000 people in East Germany. It also had a large elite paramilitary force, the Felix Dzerzhinsky Guards Regiment, that served as its armed wing. Its motto was "Shield and sword of the Party" (Schild und Schwert der Partei).
The Stasi also conducted espionage and other clandestine operations outside the GDR through its subordinate foreign-intelligence service, the Office of Reconnaissance, or Head Office A (German: Hauptverwaltung Aufklärung or HVA). Its operatives also maintained contacts and occasionally cooperated with West German terrorists.
The Stasi had its headquarters in East Berlin, with an extensive complex in Berlin-Lichtenberg and several smaller facilities throughout the city. Erich Mielke, the Stasi's longest-serving chief, controlled the organisation from 1957 to 1989 — 32 of the 40 years of the GDR's existence. The HVA, under the leadership of Markus Wolf from 1952 to 1986, gained a reputation as one of the most effective intelligence agencies of the Cold War.
After the German reunification of 1989–1991, some former Stasi officials were prosecuted for their crimes
and the surveillance files that the Stasi had maintained on millions of East Germans were declassified so that all citizens could inspect their personal files on request. The Stasi Records Agency maintained the files until June 2021, when they became part of the German Federal Archives.
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