MI5

MI5, officially called the Security Service, is one of the British secret service agencies. Its remit covers the protection of British Parliamentary democracy and economic interests, and fighting serious crime. It is mainly concerned with internal security, whilst the SIS or MI6 looks after external security. Within the government community, MI5 is colloquially known as Box (after its official wartime address of PO Box 500 and its current address—PO Box 3255, London SW1P 1AE) or simply Five. The organisation is based since 1995 at Thames House, Millbank, London. Previous headquarters have been 140, (aka "Russian House") Gower Street, 1976-95; Leconfield House, Curzon Street, 1945-76; and 124-26, Cromwell Road, 193?-37. The sites at Gower and Curzon streets are now demolished.

See also

• GCHQ
• MI6
• Special Branch
• Spooks — a BBC television drama about the work of a group of MI5 agents, which airs in the United States on the A&E Network as MI-5 (sic).
• Central Intelligence Agency - US
• Australian Security Intelligence Organisation (ASIO)
• Canadian Security and Intelligence Service
• Joint Terrorist Analysis Centre