[citation needed] The SNB was established by the coalition government as part of the Ministry of the Interior during a meeting in Košice on April 17, replacing the traditional police and gendarmes.

[2] The KSČ gained control of the Ministry of Interior[1] when Václav Nosek was appointed minister and began converting the security forces into arms of the party.

[1] Between 1945 and 1948, anti-Communist police officials and officers were fired, non-Communist personnel were encouraged to join the KSČ, and all were subjected to Communist indoctrination.

[1] Nosek's replacement of the upper police hierarchy with Communists caused the protest resignation of anti-Communist government ministers in February 1948, leading to the Czechoslovak coup d'etat of 1948.

[1] The SNB was abolished and replaced by the Czech Police on 15 July 1991 under Act 283/1991 Coll,[3] taking over its VB units[4] after the Velvet Revolution of 1989.

[1] As of 1987 the SNB was a volunteer service, although conscription was apparently used to rebuild the force after the loss of personnel at the end of Alexander Dubček's leadership.

[1] The Advanced School of the National Security Corps, which occupied a large complex of buildings in Prague, granted academic degrees to the SNB and the Border Guard, also part of the Ministry of Interior.