But if only popular ideas were protected, we wouldn't need a First Amendment. History teaches that the first target of government repression is never the last. If we do not come to the defense of the free speech rights of the most unpopular among us, even if their views are antithetical to the very freedom the First Amendment stands for, then no one's liberty will be secure. In that sense, all First Amendment rights are "indivisible."

Censoring so-called hate speech also runs counter to the long-term interests of the most frequent victims of hate: racial, ethnic, religious and sexual minorities. We should not give the government the power to decide which opinions are hateful, for history has taught us that government is more apt to use this power to prosecute minorities than to protect them. As one federal judge has put it, tolerating hateful speech is "the best protection we have against any Nazi-type regime in this country."

At the same time, freedom of speech does not prevent punishing conduct that intimidates, harasses, or threatens another person, even if words are used. Threatening phone calls, for example, are not constitutionally protected.