"Offensive language" and "sexually explicit" content were some of the reasons cited in challenges to Toni Morrison's "The Bluest Eye." The Pulitzer Prize-winning author's "Beloved" is another frequent target of censorship attempts.
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Photos:Most frequently challenged books of 2013
Sherman Alexie's young adult novel, "The Absolutely True Diary of a Part-Time Indian," tells the story of a Native American teen who attends an all-white high school. In 2013, it cracked the top 10 for the fourth year in a row. Complaints included "sensitive material in the book including excerpts on masturbation amongst other explicit sexual references, encouraging pornography, racism, religious irreverence and strong language," according to an ALA report.