Given the codename Johnny O'Brien by his Nazi paymasters, to MI5 he was known as Agent Snow Helped crack Germany's Enigma military codes Seen by Nazis as a master spy, he enabled MI5 to capture ...

For more than a decade, as Cold War tensions threatened to escalate into all-out war, Mr. Gordievsky, a senior KGB officer, passed intelligence to the British spy agency MI6, sharing secrets that ...

While climbing the ranks of the Soviet spy agency, he spent more than a decade working for British intelligence as one of its ...

WWII-era guide for UK spies to go on display ... including a first-hand account of Soviet double agent Kim Philby's 1963 confession and MI5's interest in the actor Dirk Bogarde.

The Cold War section displays a passport and a personalised briefcase left in a London club by British diplomat Guy Burgess, a Russian double agent since World War II who fled to Moscow in 1951 as ...