I recommend History on Trial. Deborah E. Lipstadt is Dorot Professor of Modern Jewish and Holocaust Studies at Emory University. I haven't read her book yet: History on Trial: My Day in Court with David Irving [Ecco 2005]. David Irving had sued the professor for libel, for calling him a holocaust denier. She won. I'm sorry to say that I didn't recognize either name. My reaction to newspaper stories about people denying that the Holocaust ever happened has been a bafflement. I dismiss them as nuts. That does not stop the damage they can do.
In the book I liked so much by May Sarton, The Education of Harriet Hatfield, some people in the neighborhood react to her new bookstore with a lot of grumbling about "pornography" and "lesbians" and "we don't want her kind here." This quickly escalates to vandalism, threats, and violence. The atmosphere of permission to hate and harm promotes criminal action. Harriet's standing her ground wins respect, and helps others.
"...When they came for the Jews, we did nothing.....When they came for us, there was no one left to do anything."