Gestapo Imposter Tricked Nazi Sympathizers in WWII

At the height of World War II, Hans Kohout wanted to give the Nazis advance word of a top-secret British tactic that could neutralize an enemy's air defenses, leaving major cities exposed to devastating air raids, according to secret intelligence files released Friday.

Kohout, a naturalized British citizen, knew about it from his work at a plant doing defense-related projects.