Forced labor and prostitution are widely known, but some of the lesser-known reasons have to do with forced marriages and organ trading. The black market organ trade isn't just something made up for novels and movies. Kidneys, livers and any other organs that can be harvested and reused are up for grabs. Traffickers often try to force their captives to voluntarily give up an organ for free. Some kidnappers actually offer to pay the donor for their organ, but this usually ends up with the "donor" being paid less than agreed upon and still being held against his will. In some cases the victim is knocked out, operated on and left without an organ or