In 1977, a Chicago-based Nazi group announced its plans to demonstrate in Skokie, Illinois, the home of hundreds of Holocaust survivors. The shocked survivor community rose in protest and the issue went to court, with the ACLU defending the Nazis’ right to free speech. The court ruled in the Nazis’ favor. According to the “content neutrality doctrine” governing First Amendment jurisprudence, the Nazis’ insults and villifications were “neutral”--not the issue, as far as the law was concerned. But to Downs, they are at issue. In Nazis in Skokie he challenges the doctrine of...