If your book group is looking for a reading challenge--each of these books has been challenged by a parent or a community.  This year marks the 30th Anniversary of American Libraries Association's Banned Books Week, September 30 - October 6, 2012.
 

The Great Gatsby by F. Scott Fitzgerald ; preface and notes by Matthew J. Bruccoli

The Grapes of Wrath by John Steinbeck ; introduction and notes by Robert DeMott

Their Eyes Were Watching God by Zora Neale Hurston ; with a foreword by Edwidge Danticat and an afterword by Henry Louis Gates, Jr

The Chocolate War: a Novel by Robert Cormier