The State Vigilance Bureau is the main investigative unit of the Vigilance Department. The main investigating wing was started in June, 1967, when the Govt. set up a Special Inquiry Agency (SIA) for enquiring into corruption related complaints referred to it by the Vigilance Department. Progressive expansions took place from time to time and at present there is fairly widespread and effective network throughout the State.

    The Special Inquiry Agency was rechristened as the State Vigilance Bureau in the year 1978 and presently functions as such under the charge of its Director who is an IPS Officer in the rank of Director General of Police / Addl. Director General of Police. The Director, who is the head of Department is assisted by an Inspector General of Police, Deputy Inspector(s) General of Police, Superintendent(s) of Police, Deputy Superintendent(s) of Police and officers / officials of other ranks.