Victims of trafficking are often isolated: They're told that contact with police with trigger their own arrest and they're afraid of beatings or reprisals by the traffickers themselves.
The Polaris Project's National Human Trafficking Resource Center, a 24-hour government-funded national trafficking hotline, has become a lifeline for some.
• National Human Trafficking Resource Center hotline: 1-888-3737-888
• Hotlines all over the world
In the video, actress Mira Sorvino, in her role as a Goodwill Ambassador for the U.N. Office on Drugs and Crime, helps build awareness of the human trafficking issue and takes CNN on a behind-the-scenes tour of the crisis center.