slavery slavery

Louis E. Pratt, master ivory cutter for Pratt, Read & Co., shows off eight ivory tusks, April 1, 1955. Courtesy of Deep River Historical Society hide caption

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Courtesy of Deep River Historical Society

Elephant Slaughter, African Slavery And America's Pianos

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A pedestrian walks along Lambeth Road in south London on Friday. Police have rescued three women from a home in the neighborhood. They were held hostage for some 30 years, according to authorities. Andy Rain/EPA/Landov hide caption

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Andy Rain/EPA/Landov

Child laborers wait to be processed at a safe house after being rescued during a raid at a factory in New Delhi by workers from Bachpan Bachao Andolan (Save the Childhood Movement) in June. Kevin Frayer/AP hide caption

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Kevin Frayer/AP

Listen to All Things Considered's Audie Cornish interview study author Kevin Bales.

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Prostitutes arrested in Guatemala City in 2012, as part of an operation against human trafficking. Johan Ordonez/AFP/Getty Images hide caption

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Johan Ordonez/AFP/Getty Images