The First Amendment puts it this way: "Congress shall make no law...abridging the freedom of speech, or of the press." Yet, in 1960, a city official in Montgomery, Alabama, sued The New York Times for libel -- and was awarded $500,000 by a local jury -- because the paper had published an ad critical of Montgomery's brutal response to civil rights protests. The centuries of legal precedent behind the Sullivan case and the U.S. Supreme Court's historic...