As a sociologist and legal scholar, I struggle to explain the boundaries of free speech to undergraduates. Despite the First Amendment – I tell my students – local, state, and federal laws limit all kinds of speech. We regulate advertising, obscenity, slander, libel, and inciting lawless action to name just a few. My students nod along until we get to racist and sexist speech. Some can't grasp why, if we restrict so many forms of speech, we don't also restrict hate speech. Why, for example, did the Supreme Court on Monday rule that the trademark office cannot reject "disparaging" applications – like a request from an Oregon band to trademark "the Slants" as in Asian "slant eyes."