In former Czechoslovakia, State Security (Czech: Státní bezpečnost, Slovak: Štátna bezpečnosť) or StB / ŠtB, was a plainclothes secret (political) police force from 1945 to its dissolution in 1990. Serving as an intelligence and counter-intelligence agency, it dealt with any activity that could possibly be considered anti-communist.
Read more about StB: History, Organization Within The Czechoslovak Government, Memorable People