MI5, officially the Security Service, is the United Kingdom's domestic counter-intelligence and security agency and is part of its intelligence machinery alongside the Secret Intelligence Service (MI6), Government Communications Headquarters (GCHQ), and Defence Intelligence (DI). MI5 is directed by the Joint Intelligence Committee (JIC), and the service is bound by the Security Service Act 1989. The service is directed to protect British parliamentary democracy and economic interests and to counter terrorism and espionage within the United Kingdom (UK). Within the civil service community, the service is colloquially known as Box, or Box 500, after its official wartime address of PO Box 500; its current address is PO Box 3255, London SW1P 1AE.
Sir David Petrie was Director General (DG) of MI5, the United Kingdom's internal security service, from 1941 to 1946.
Sir Michael Bowen Hanley KCB was Director General (DG) of MI5, the United Kingdom's internal security service, from 1972 to 1978.
Sir Howard Frank Trayton Smith was a British diplomat who served as Director General of MI5 from 1978 to 1981.
Sir Arthur Antony Duff was a senior British diplomat and Director General of MI5.
The Directorate of Military Intelligence (DMI) was a department of the British War Office.
Brigadier Oswald Allen Harker CBE (1886–1968), known as Jasper Harker, was Acting Director General of MI5 from 1940 to 1941.
The General Intelligence Agency of Mongolia is the intelligence agency of the Mongolian government, under the direct control of the Prime Minister of Mongolia. Its headquarters is in the Mongolian capital of Ulaanbaatar. The GIA employs several hundreds of people and acts as an early warning system to alert the Mongolian government of national security threats. It collects and evaluates information on a variety of areas such as international terrorism, organized crime, weapons and drug trafficking, money laundering, illegal migration and information warfare.
