A closer look at recently declassified MI5 files on the intelligence failure surrounding the five "Cambrdige spies" ...

Trove of newly declassified files detail investigations into some of the country’s most notorious double agents, the ‘Ring of Five’, who passed information to the Soviets for three decades ...

The British secret service has declassified new documents about the famous spy who ended up fleeing to Moscow, where he died alone and drunk 25 years later ...

Helenus Milmo, a barrister and wartime MI5 officer, was tasked with trying to wring the truth from Kim Philby. Some seven ...

Kim Philby was the quintessential spy ... from his recruitment as a young communist in 1934 to his dramatic defection to Moscow in 1963. Packed with confessions, lies, and betrayals, these ...