A briefcase abandoned by infamous Cambridge spy Guy Burgess as he fled to Moscow in 1951 is among the never-before-seen MI5 artefacts going ... being a Soviet agent. The note mentions how the ...

Advertisement Article continues below this ad MI5 Director General Ken McCallum ... Spies,” whose members spilled secrets to the Soviet Union from the heart of the U.K. intelligence establishment.

a 110-year-old lemon used for invisible ink and a letter about the Queen's response to news of a Soviet agent in Buckingham Palace are among MI5 artefacts on display in a "groundbreaking" new ...

MI5 Director General Ken McCallum told journalists ... “Cambridge Spies,” whose members spilled secrets to the Soviet Union from the heart of the U.K. intelligence establishment.