The Catcher in the Rye — J.D. Salinger

J.D. Salinger's coming-of-age novel has been the most challenged book in American high schools for decades, objected to for profanity, sexual content, and anti-establishment attitudes. It was famously found in the possession of both the person who shot John Lennon and the person who attempted to assassinate Ronald Reagan, leading to occasional (baseless) claims that the book incites violence.