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Mehdi Insurgents.jpg
A Mehdi militiaman guards the doorway of a commander's house in Sadr City, Iraq on June 10, 2004.  Lead by Shiite cleric Moqtada al-Sadr, the group is said to have about 10, 000 members in Sadr City alone, made up of largely young, poor men.  (photo by Khampha Bouaphanh)