Today ends Banned Books Week, the annual celebration of the freedom to read. When someone challenges a book, they are seeking to restrict or remove it from a library or curriculum. If a challenge to a book succeeds, it’s removed and banned. Banning a book restricts access of information to its readers. Because of this, many cases challenging books have arguments based on the First Amendment. Find a list of notable First Amendment cases on challenged and banned books here. Most of the challenges are not successful because of people who oppose the suppression of access to information, such as librarians and teachers. For an exhaustive list of frequently challenged books, check this out.