Three-time world heavyweight champion, media superstar, African-American hero, American icon. Muhammad Ali is all these things, but for many Americans unsettled by the turbulence of the 1960s, he was also something else: a threat. Like his early friend Malcolm X, Ali was defiant, strong, Muslim and black. And in some quarters, Ali's refusal to heed his Vietnam-era induction order branded him an unpatriotic draft dodger. Director Michael Mann's reverential biopic attempts to resurrect this other Ali, focusing on ten crucial years between the boxer's first heavyweight title victory in 1964 and 1974's "Rumble in the Jungle," when Ali wrested the title back from George F...