The U.S. government gave the slave trade a boost by offering money for al-Qaeda and Taliban fighters. Afghan and Pakistani warlords simply rounded up people who looked Arab or foreign and sold them to the Americans as captured fighters. The "fighters" apparently included relief workers, refugees, and Arab businessmen. The tribunals looking into the classification of Guantanamo prisoners as "enemy combatants" have uncovered numerous examples of hapless victims of a naive U.S. government too flush with money.
http://www.antiwar.com/roberts/?articleid=6185
http://www.antiwar.com/roberts/?articleid=6185