Inside the Woodridge Neighborhood Library in the U.S. capital, a wall is plastered with ominous warning signs: “Reading This Book Display Is Banned” and “No Books to See Here.” Below the messages are shelves with books that have been banned, at one time or another, in parts of the United States. They include books in the popular Harry Potter series, banned for “witchcraft,” and the classic futuristic novel Brave New World, which has been banned for sexual content. Although no books have been removed from libraries or schools in Washington, …