Most frequently challenged books of 2013

Photos: Most frequently challenged books of 2013
Each year, the American Library Association releases a top 10 list of challenged books based on reports to its Office of Intellectual Freedom. The most recent list, of 2014's banned books, will be out in late September. Dav Pilkey's "Captain Underpants" series, a frequent target, topped the list in 2013 because of "offensive language" and "violence." Click through the gallery for the rest of the list.
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Photos: Most frequently challenged books of 2013
"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.
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Photos: Most frequently challenged books of 2013
E.L. James' mega-best-seller "Fifty Shades of Grey" made its debut on the list in 2012 based on complaints citing offensive language and sexually explicit material.
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Photos: Most frequently challenged books of 2013
Suzanne Collins' "The Hunger Games" returned to the top 10 list for the second time in 2013 after making its debut in 2011. Its "religious viewpoint" was one reason cited in requests to remove the books from schools and libraries, the ALA said.
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Photos: Most frequently challenged books of 2013
"A Bad Boy Can Be Good for a Girl" by Tanya Lee Stone made its debut on the top 10 list in 2013. The story of three girls who date the same bad boy contains references to drugs, alcohol, smoking and nudity -- some of the reasons cited in challenges.
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Photos: Most frequently challenged books of 2013
John Green's "Looking for Alaska" returned to the top 10 list for the second time in 2013. The coming-of-age tale about a teen who falls in love at boarding school won the ALA's 2006 Michael L. Printz Award for the best book written for teens.
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Photos: Most frequently challenged books of 2013
Stephen Chbosky's "The Perks of Being a Wallflower" debuted on the ALA's list of top 10 most frequently challenged books in 2004. References to drugs, alcohol, smoking, homosexuality and sexually explicit material were among reasons cited in challenges to the book, according to the ALA.
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Photos: Most frequently challenged books of 2013
"Bless Me, Ultima" by Rudolfo Anaya first landed on the top 10 list of most frequently challenged books in 2008. It returned to the list in 2013 over complaints of references to the occult/Satanism, offensive language and sexually explicit material.
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Photos: Most frequently challenged books of 2013
Political viewpoints, racism and violence were the top reasons cited in challenges to Jeff Smith's "Bone" comics. The award-winning series made its debut on the ALA's list of top 10 most frequently challenged books in 2013.
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