Anthony Blunt, who worked at Buckingham Palace as Surveyor of the Queen’s Pictures, was secretly a Soviet spy during WWII.

Newly released MI5 files from the National Archives reveal that British intelligence monitored potential connections between French government interests and nationalist movements in Scotland and Wales ...

The newly-declassified documents include details about some of the UK's most notorious spies.

A World War II-era tailing guide is among declassified records shedding light on spy game in MI5: Official Secrets, at the ...

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 ...

Queen Elizabeth II was not officially informed for almost a decade that one of her most senior courtiers had confessed to ...

Despite advances in electronic surveillance, security service MI5 still relies on human ‘watchers’. Government documents ...

Top secret MI5 files detailing first-hand accounts of confessions of three of Britain's most notorious double agents ...

The guidance will feature in a new exhibition at the National Archives focusing on the work of the Security Service.

A newly declassified document is on display at the National Archives. It reveals the advice given to new MI5 recruits during ...

MI5 feared film star Dirk Bogarde could be the target of a KGB gay "entrapment" attempt after it emerged he was on a list of ...

The files about royal art historian Anthony Blunt are among a trove from the intelligence agency MI5 released Tuesday by ...