MI5's fortunes in world War II, from initial disarray to the success of Double Cross.

During the Second World War, it developed the Double-Cross System. This involved attempting to 'turn' captured agents wherever possible, and use them to mislead enemy intelligence agencies. After the war, the service was instrumental in breaking up a …

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.

2011年2月17日 · Intelligence expert and spy writer Nigel West uncovers the dramatic story of wartime double cross. MI5's performance in running a stable of double agents during the Second World War is still...

MI5 played a key role in World War II, combating enemy espionage, intercepting German communications and feeding back misinformation.

2025年1月15日 · 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.

The Double-Cross System or XX System was a World War II counter-espionage and deception operation of the British Security Service (MI5). Nazi agents in Britain – real and false – were captured, turned themselves in or simply announced themselves, and were then used by the British to broadcast mainly disinformation to their Nazi controllers.

Find out more about MI5’s mission and core values; our people who work to keep the country safe; and our rich and varied history. Our headquarters, Thames House, in central London is a Grade II...

2016年5月31日 · Juan Pujol Garcia, best known as MI5 agent GARBO, was the greatest Allied double agent in WW2 for his wild role ensuring victory on D-Day. Today TGNR continues it’s campaign recognizing the most important and lesser known heros of the Second World War.

2025年1月14日 · Rookie wartime MI5 "watchers" were advised they needed to be prepared to offer a big tip if they had to tell a taxi driver to "follow that cab" when pursuing a suspect, newly declassified...