Today is the international day of remembrance for the abolition of slavery, but according to The International Organization for Migration up to 4 million people around the world are still being trafficked for labour and sexual exploitation every year.
(The actual figures are vague, but human trafficking is the fastest-growing source of profit for organized crime. I can only quote from the Manic Street Preachers: "If you tolerate this. Then your children will be next.")