Most of the victims are believed to be Rohingya Muslims fleeing persecution in Myanmar. They are held until their families pay more money, which few can afford to do.
Some of the seafood that winds up in American grocery stores, in restaurants, even in cat food may have been caught by Burmese slaves, a yearlong investigation by The Associated Press finds.
Scientists interviewed more than 1,000 men, women and children who were forced into sex work and hard labor. The result is the largest study to detail the health of human trafficking survivors.
Stories of trafficking — including a sting using a "Walking Dead" actress — are making headlines. An expert talks about the practice, which victimizes millions around the world.