Books are still challenged and banned in the United States and around the world. Books lke Mark Twain's "The Adventures of Huckleberry Finn," J.D. Salinger's "The Catcher in the Rye," John Steinbeck's "Of Mice and Men
," and Harper Lee
's "To Kill a Mockingbird
" are still among the most frequently challenged books, but other books have been repressed on political, social, or sexual grounds. Some books have been challenged or banned because they appeared to be "obscene" or objectionable. Walt Whitman
's "Leaves of Grass" was cited as being "too sensual" and "immoral."