The KGB was the main security agency for the Soviet Union from 13 March 1954 As a direct successor of preceding agencies such as the Cheka, GPU, OGPU, NKGB, NKVD and MGB, it was attached to the Council of Ministers. It was the chief government agency of "union-republican jurisdiction", carrying out internal security, foreign intelligence, counter-intelligence and secret-police functions. Similar agencies operated in each of the republics of the Soviet Union aside from the Russian.