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The four main agencies are the Secret Intelligence Service (SIS or MI6), the Security Service (MI5), the Government Communications Headquarters (GCHQ) and Defence Intelligence (DI). The agencies are organised under three government departments , the Foreign Office , the Home Office and the Ministry of Defence .
MI6 is included as an alias on the Secret Intelligence Service website, though the official abbreviation, SIS, is predominant. While the names remain, the agencies are now responsible to different departments of state, MI5 to the Home Office , and MI6 the Foreign Office .
MI5 (Military Intelligence, Section 5), [2] 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).
The Secret War Between the Wars: MI5 in the 1920s and the 1930s. Bowyer. ISBN 978-1-84383-938-5.. Read, Anthony, and David Fisher (1984). Colonel Z: The Life and Times of a Master of Spies (London: Hodder and Stoughton 1984). Aldrich, Richard (2000). Intelligence and the War Against Japan Britain, America and the Politics of Secret Service ...
Oleg Penkovsky, a Soviet military intelligence colonel, who was a defector in place, was a joint US-UK espionage operation. Much of Penkovsky's product is available online at the CIA FOIA Reading Room under the code name IRONBARK. [2] A major source of tension between the two countries was Kim Philby, a senior UK SIS officer who was a Soviet ...
Secret Intelligence Service (SIS)/MI6 [49] – Foreign intelligence gathering and analysis. Defence Intelligence (DI) [50] – Military intelligence analysis. Signals intelligence Government Communications Headquarters (GCHQ) [51] – Signals intelligence gathering and analysis. Criminal Intelligence and Protected Persons
A similar relationship exists in Britain between MI5 and MI6. The distinction, or overlap, between security agencies, national police , and gendarmerie organizations varies by country. For example, in the United States , one organization, the FBI, is a national police, an internal security agency, and a counterintelligence agency.
Defence Intelligence (DI) is an organisation within the United Kingdom intelligence community which focuses on gathering and analysing military intelligence.It differs from the UK's intelligence agencies (MI6, GCHQ and MI5) in that it is an integral part of a government department – the Ministry of Defence (MoD) – rather than a stand-alone organisation.