This years American Library Association list of the most challenged books in the US is GO!
Defined as “a formal, written complaint, filed with a library or school requesting that materials be removed because of content or appropriateness” - topped by the The Adventures of Captain Underpants series (a former winner in 2012.)
Cited for offensive language, unsuited for age group, and violence… Captain Underpants beat back competition from Fifty Shades of Grey and The Hunger Games.
