Powers had been sentenced to 10 years’ confinement in the USSR but, amidst concerns that he might reveal any remaining secrets to the Soviet authorities, the U.S. government agreed to exchange Powers and imprisoned student Frederic Pryor in return for Soviet Colonel Rudolf Abel.
The last execution at the Tower of London took place on the 15th August 1941. Josef Jakobs was a German spy who was arrested after he signalled for help after breaking his ankle when he parachuted into Britain.
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Julius and Ethel Rosenberg were sentenced to death in the United States for conspiracy to commit espionage.
British nurse Edith Cavell was executed by a German firing squad during the First World War.