During the summer of 1937, Britain was so full of spies that posters were put up in public areas warning people that “Silence is safety, Now more than ever – forget what you hear” and “Be like Dad – keep Mum.”  Although most people were alert, no one expected a group of clean-cut teenage boys to be guilty of spying.

Source: In 1937 Young Nazi “Spyclists” Traveled Around Britain for Reconnaissance

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