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According to the Polaris Project, 

"Human trafficking is the business of stealing freedom for profit. In some cases, traffickers trick, defraud or physically force victims into selling sex. In others, victims are lied to, assaulted, threatened or manipulated into working under inhumane, illegal or otherwise unacceptable conditions. It is a multi-billion dollar criminal industry that denies freedom to .... people around the world."

https://polarisproject.org/human-trafficking/