From its establishment on 30 June 1945, the StB was controlled by the
Communist Party of Czechoslovakia. The Party used the StB as an instrument of power and repression; State Security spied on and intimidated political opponents of the Party and forged false criminal evidence against them, facilitating the communists' rise to power in 1948. After the arrival of Soviet advisors in 1949, nearly a year after the Communist Party of Czechoslovakia seized power, the StB began to undergo a fundamental ideological change as the older generation of experienced, educated, and mostly middle-class secret police began to be replaced or purged. The replacements were a younger generation of secret police who were mostly from working class backgrounds and were drowned in the intense rhetoric of class struggle and political loyalty. Under the tutelage of Soviet advisors, the younger generation adopted a
Stalinist ideology and obtained
forced confessions by means of torture, including the use of psychoactive drugs, blackmail, and kidnapping. Other common practices included
telephone tapping, permanent monitoring of apartments, intercepting private mail, house searches, surveillance, and arrests and indictment for so-called "subversion of the republic". After the coup, the StB conducted
Operation Border Stone to capture citizens who attempted to defect and cross the
Iron Curtain. StB was the main supporter of the
Red Brigades, an Italian far-left militant organization. In cooperation with the
Palestine Liberation Organization (PLO), the StB conducted logistic support and training for Red Brigades in PLO training camps in North Africa and Syria. The StB's part in the
fall of the regime in 1989 remains uncertain. The reported murder of a student by police during a peaceful demonstration in November 1989 was the catalyst for wider public support and further demonstrations, leading to the overthrow of the communist regime. According to StB agent , he was used to impersonate a fictitious dead student,
Martin Šmíd. However, in 1992, the Czechoslovak parliamentary commission for investigation of events of 17 November 1989 has ruled out Zifčák's testimony, stating that "the role of former StB lieutenant L. Zifčák was only marginal, without any connection to critical events and without any active effort to influence these events. Investigation of related circumstances has indisputably proved that L. Zifčák's testimony that attributes a key role in November's events to himself is based on facts, which are either technically impossible and unfeasible, or contradict actions of persons mentioned by him, which aimed to completely different goals." State Security was dissolved on 1 February 1990. The current intelligence agency of the Czech Republic is the
Security Information Service. Former employees and associates (informers) of the StB are
currently banned from taking certain jobs, such as legislators or police officers. The
Act on Lawlessness of the Communist Regime and on Resistance Against It states that the StB, as an organization based on the ideology of the Communist Party, "aimed to suppress human rights and democracy through its activities" and thus based on a criminal ideology. == Organization within the Czechoslovak government==