The U.S. Supreme Court this week takes up the question of who qualifies as a supervisor when the issue is harassment in the workplace. The court's answer to that question could significantly restrict employer liability in racial and sexual harassment cases, or, in the view of some business organizations, it could result in frivolous litigation. "There are lots of situations where people have power over other employees when they don't have the power to fire them, to discipline them, to promote them, to set their wages or things like that," says University of Virginia law ...