Who is Muqtada al-Sadr?

As Iraq dissolves into civil war, few men wield more power on its bloodstained streets than Muqtada al-Sadr. In just four years, his potent blend of Shia nationalism, enforced by the 70,000-strong Mehdi Army, has made him a hero to millions - and put him top of America's hit list. But does the future rest in his hands? Patrick Cockburn reports

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