He calls himself Sharif. He is a young man without a beard who wears a hoodie and athletic shoes. He doesn't look anything like a member of the Muslim Brotherhood, but rather like one of those young revolutionaries his men are assaulting with stones, sticks and steel rods. Sharif says that he hates these liberals and leftists, who began protesting against the Muslim Brotherhood and its president, Mohammed Morsi, after he acquired sweeping new powers through a decree issued in late November. Over the weekend, Morsi moved to rescind that decree, replacing it with a weaker one. But opposition protests have hardly abated as a referendum on the country's controversial draft constitution approaches in a few days. Sharif's strong feelings, meanwhile, led him to take command of a group of Islamist thugs last week.