Codename Tricycle: The True Story Of The Second... Now

: He provided vital data on German rocketry and strategy and built the "Yugoslav Ring" network to funnel false info to Berlin.

Popov was a wealthy lawyer, debonair polyglot, and notorious playboy who operated at the highest echelons of society. Codename Tricycle: The True Story of the Second...

: In 1941, the Abwehr sent Popov to the U.S. to scout defenses, including Pearl Harbor. He attempted to warn the FBI of the impending Japanese interest, but J. Edgar Hoover ignored the warning, dismissing Popov as a "moral degenerate". : He provided vital data on German rocketry

: Originally recruited by the German Abwehr in 1940, the 27-year-old Popov immediately offered his services to the British. to scout defenses, including Pearl Harbor

Popov spent the war feeding the Germans carefully vetted "intelligence" that made him one of their most trusted assets while secretly advancing Allied goals.