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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).
Fifth Column was the name MI5, the British Security Service, gave to a World War II operation run from 1942 until at least 1947.It was initially intended to identify people who would be willing to assist Germany in the event of an invasion of the United Kingdom, but as it developed, it also acted to divert its targets away from harmful activities.
MI5, with advance warning of infiltration, had no trouble picking up almost all of the spies sent to the country. Writing in 1972, John C. Masterman (who had, later in the war, headed the Twenty Committee) said that by 1941, MI5 "actively ran and controlled the German espionage system in [the United Kingdom]." It was not an idle boast; post-war ...
Eric Arthur Roberts (18 June 1907 – 17 [1] or 18 [2] December 1972) was an MI5 agent during the Second World War under the alias Jack King. [3] [4] By posing as a Gestapo agent and infiltrating fascist groups in the UK, Roberts was able to prevent secret information from finding its way to Germany. [5]
Pages in category "MI5" ... British Services Security Organisation (Germany) C "Christmas tree" files; D. The Defence of the Realm ... Wikipedia® is a registered ...
The British Services Security Organisation (Germany) (abbreviated as BSSO(G)) was a MI5 sponsored organisation supporting British senior commanders with multi-source security intelligence directed initially at counter espionage, but near the end of its operational life much involved in counter terrorism support.
Nathalie "Lily" Sergueiew (January 24, 1912 – May 17, 1950) was a double agent who worked for MI5 during World War II under the codename "Treasure". She played a significant role in the Double-Cross System, particularly by deceiving the Germans about the location of the D-Day landings.
An MI5 officer wrote in an assessment "the Germans came to love Chapman ... but although he went cynically through all the forms, he did not reciprocate. Chapman loved himself, loved adventure, and loved his country, probably in that order". [19] While in Oslo he also secretly photographed the German agents who stayed at his safe house.