At the University of Pennsylvania, a student is reprimanded for calling a group of African-American students water buffalo. Several prominent American law schools now request that professors abstain from discussing the legal aspects of rape for fear of offending students. As debates over multiculturalism and political correctness crisscross the land, no single issue has been more of a flash point in the ongoing culture wars than hate speech codes, which seek to restrict bigoted or offensive speech and punish those who engage in it. In this provocative anthology, a range of prominent voices...