The first full account of Nazi spies in 1930s America and how they were exposed.

In the mid-1930s just as the United States was embarking on a policy of neutrality, Nazi Germany launched a program of espionage against the unwary nation. The Nazi Spy Ring in America tells the story of Hitler’s attempts to interfere in American affairs by spreading anti-Semitic propaganda, stealing military technology, and mapping US defenses.

This fast-paced history provides essential insight into the role of espionage in shaping American perceptions of Germany in the years leading up to US entry into World War II. Fascinating and thoroughly researched, The Nazi Spy Ring in America sheds light on a now-forgotten but significant episode in the history of international relations and the development of the FBI.

Using recently declassified documents, prize-winning historian Rhodri Jeffreys-Jones narrates this little-known chapter in US history. He shows how Germany’s foreign intelligence service, the Abwehr, was able to steal top secret US technology such as a prototype codebreaking machine and data about the latest fighter planes.

At the center of the story is Leon Turrou, the FBI agent who helped bring down the Nazi spy ring in a case that quickly transformed into a national sensation. The arrest and prosecution of four members of the ring was a high-profile case with all the trappings of fiction: fast cars, louche liaisons, a murder plot, a Manhattan socialite, and a ringleader codenamed Agent Sex. Part of the story of breaking the Nazi spy ring is also the rise and fall of Turrou, whose talent was matched only by his penchant for publicity, which eventually caused him to run afoul of J. Edgar Hoover's strict codes of conduct.

America’s first anti–sex trafficking law, the 1910 Mann Act, made it illegal to transport women over state lines for prostitution “or any other immoral purpose.” It was meant to protect women and girls from being seduced or sold into sexual slavery. But, as Jessica Pliley illustrates, its enforcement resulted more often in the policing of women’s sexual behavior, reflecting conservative attitudes toward women’s roles at home and their movements in public. By citing its mandate to halt illicit sexuality, the fledgling Bureau of Investigation gained entry not only into brothels but also into private bedrooms and justified its own expansion.

Policing Sexuality links the crusade against sex trafficking to the rapid growth of the Bureau from a few dozen agents at the time of the Mann Act into a formidable law enforcement organization that cooperated with state and municipal authorities across the nation. In pursuit of offenders, the Bureau often intervened in domestic squabbles on behalf of men intent on monitoring their wives and daughters. Working prostitutes were imprisoned at dramatically increased rates, while their male clients were seldom prosecuted.

In upholding the Mann Act, the FBI reinforced sexually conservative views of the chaste woman and the respectable husband and father. It built its national power and prestige by expanding its legal authority to police Americans’ sexuality and by marginalizing the very women it was charged to protect.