Our tangled American history illustrates that those in power usually don't care much for vigorous public criticism. An unfortunate national pastime includes attempts to silence those with unpopular views, dissenting voices, or minorities. In most instances the First Amendment ended these repressive acts, giving rise to our national civil rights movement, protecting dissenters of every stripe, and even guarding the right of political free speech. But these rights remain in peril due to continued efforts by some to silence and intimidate their opponents.