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

Secret UK Files Detailing Confessions of Cambridge Five Spies Released By Michael Holden LONDON (Reuters) - Top secret MI5 ...

Britain’s National Archives on Tuesdayreleased declassified MI5 domestic counterintelligence agency files containing the ...

MI5 documents reveal her private secretary ‘saw no advantage in telling her’ about treachery of Buckingham Palace art expert ...