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MI5

Translation
MI5
/em"uy'fuyv"/, n. (in Great Britain)
the government's security and counterespionage service that works in liaison with Scotland Yard's Special Branch.
[M(ilitary) I(ntelligence, Section) 5]

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in full Military Intelligence (Unit 5)

British Security Service.

Originally organized in 1909 to counter German espionage, in 1931 it assumed wider responsibility for assessing threats to national security, including communist subversion and subsequently fascism. Today the Security Service Act (1989) forms its statutory basis. As Britain's domestic-security intelligence agency, its purpose is to protect the country against threats such as terrorism, espionage, and subversion. Since the passing of the Security Service Act (1996), its role has been expanded to include supporting law-enforcement agencies in the field of organized crime.

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▪ British government
formally  Security Service 

       intelligence agency charged with internal security and domestic counterintelligence activities of the United Kingdom. It is authorized to investigate any person or movement that might threaten the country's security. Although MI5 is responsible for domestic counterespionage, it has no powers of arrest, which devolve instead on Scotland Yard.

      MI5's earliest antecedent was a secret service formed in 1569 by Sir Francis Walsingham (Walsingham, Sir Francis), who later became secretary of state to Elizabeth I. In the early 20th century it was realized that some form of centralized control of intelligence functions was necessary. MI5 was formed in 1909 under the leadership of Vernon Kell, then a captain in the British army, to identify and counteract German spies then working in Britain, which it did with great effect. Kell retired as a major general in 1924 and was later knighted but remained in charge of the agency until 1940. (The name “MI5” originated during this period, when the agency was “section five” of military intelligence.)

      MI5 enjoyed great success during World War II, but its record during the Cold War was mixed. Widely publicized blunders during that period—e.g., the Soviet Union was found to have deeply penetrated both MI5 and MI6, the agency responsible for foreign intelligence—undermined confidence in MI5. A secretive organization, it first publicly named its head in 1991. At that time it also made public some previously classified information, such as the number of its employees and its organizational structure. Counterterrorism operations account for much of MI5's activities. MI5 reports to the Home Office.

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Universalium. 2010.

  
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