There's a really interesting historical example (http://www.kansaspress.ku.edu/strwhe.html) of this that happened right in the middle of America's heartland the year I was born: a Neo-Nazi group wanted to march in the city of Skokie, Illinois, which has a huge Jewish population. The city refused to let them march -- and the ACLU took them to court. And won.

We watched a film about it in civics class in high school.