front cover of Crossing over the Line
Crossing over the Line
Legislating Morality and the Mann Act
David J. Langum
University of Chicago Press, 1994
Crossing over the Line describes the folly of the Mann Act of 1910—a United States law which made travel from one state to another by a man and a woman with the intent of committing an immoral act a major crime. Spawned by a national wave of "white slave trade" hysteria, the Act was created by the Congress of the United States as a weapon against forced prostitution.

This book is the first history of the Mann Act's often bizarre career, from its passage to the amendment that finally laid it low. In David J. Langum's hands, the story of the Act becomes an entertaining cautionary tale about the folly of legislating private morality.

Langum recounts the colorful details of numerous court cases to show how enforcement of the Act mirrored changes in America's social attitudes. Federal prosecutors became masters in the selective use of the Act: against political opponents of the government, like Charlie Chaplin; against individuals who eluded other criminal charges, like the Capone mobster "Machine Gun" Jack McGurn; and against black men, like singer Chuck Berry and boxer Jack Johnson, who dared to consort with white women. The Act engendered a thriving blackmail industry and was used by women like Frank Lloyd Wright's wife to extort favorable divorce settlements.

"Crossing over the Line is a work of scholarship as wrought by a civil libertarian, and the text . . . sizzles with the passion of an ardent believer in real liberty under reasonable laws."—Jonathan Kirsch, Los Angeles Times

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front cover of Policing Sexuality
Policing Sexuality
The Mann Act and the Making of the FBI
Jessica R. Pliley
Harvard University Press, 2014

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.

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