Groups of parents are getting together and organizing in their communities to ban books," adds Joan Bertin of the National Coalition Against Censorship. "I think what's happening is once a book is challenged in one town, people on the same wavelength, it will flag that book for them. For example, we've seen three challenges to Sherman Alexie's teen novel The Absolutely True Diary of a Part-Time Indian, all within the past three months, two in Missouri, one in Montana."