The National Security Guard (NSG), commonly known as Black Cats, is a counter-terrorism unit of India under the Ministry of Home Affairs. It was founded on 16 October 1984, following Operation Blue Star, to combat terrorist activities and protect states against internal disturbances. Formalised in the Parliament of India under the National Security Guard Act, 1986. It is one of the seven Central Armed Police Forces of India.

The Ministry of Home Affairs, or simply the Home Ministry, is a ministry of the Government of India. It is mainly responsible for the maintenance of internal security and domestic policy. It is headed by Minister of Home Affairs.