Rishiyur Nataraja Manickam was an Indian Police Service officer in the Intelligence Bureau and the Research and Analysis Wing, and retired as Principal Director in R&AW's co-agency, Directorate General of Security. He was Director of the Aviation Research Centre during the Bangladesh War.

The Directorate General of Security is an organisation of covert operations under India's Cabinet Secretariat. It is one of the four legally defined intelligence organisations of India and listed in the Schedule of the Intelligence Organisations Act, 1985, the other three being I.B., R&AW and NTRO. Since 1971, the Secretary, Research and Analysis Wing has usually held the post of Director General. This organisation used to be composed of Special Service Bureau, Aviation Research Centre, Special Frontier Force and Chief Inspectorate of Armaments. Since the shifting of SSB and CIOA to the Ministry of Home Affairs in 2001, DGS consists of ARC and SFF only. The Special Group, a non-Tibetan and Sarsawa-based unit of SFF, is also a DGS component.