A statewide ban on affirmative action has focused University of Michigan students' attention on racial tensions on campus--and they're starting to fight back, with a diversity push from an unexpected player: the fraternity and sorority scene. Self-segregation long plagued fraternities and sororities, but they've now launched an "unprecedented" move to reverse that, the Michigan Daily reports. Last month, a historically black fraternity hosted a party with an integrated guest list, and this spring, historically black and Latino groups plan to join the majority-white ones in the school's Greek Week, the Daily reports. Michigan's vice president of the historically black National Pan-Hellenic Council told the paper that the affirmative action ban accelerated the efforts. "It's crunch time now, game time," he said.