Among the Radcliffe Publishing Course Top 100 Novels of the 20th Century, the 46 titles listed below have been banned or challenged according to the American Library Association Office for Intellectual Freedom. 

Why are these classics challenged?

1. The Great Gatsby, by F. Scott Fitzgerald 
2. The Catcher in the Rye, by J.D. Salinger 
3. The Grapes of Wrath, by John Steinbeck 
4. To Kill a Mockingbird, by Harper Lee 
5. The Color Purple, by Alice Walker 
6. Ulysses, by James Joyce
   
7. Beloved, by Toni Morrison
   
8. The Lord of the Flies, by William Golding
   
9. 1984, by George Orwell
   
10. Lolita, by Vladmir Nabokov
    
11. Of Mice and Men, by John Steinbeck
    
12. Catch-22, by Joseph Heller
    
13. Brave New World, by Aldous Huxley
    
14. Animal Farm, by George Orwell
    
15. The Sun Also Rises, by Ernest Hemingway
    
16. As I Lay Dying, by William Faulkner
    
17. A Farewell to Arms, by Ernest Hemingway
    
18. Their Eyes Were Watching God, by Zora Neale Hurston
    
19. Invisible Man, by Ralph Ellison
    
20. Song of Solomon, by Toni Morrison
    
21. Gone with the Wind, by Margaret Mitchell
    
22. Native Son, by Richard Wright
23. One Flew Over the Cuckoo's Nest, by Ken Kesey
    
24. Slaughterhouse-Five, by Kurt Vonnegut
    
25. For Whom the Bell Tolls, by Ernest Hemingway
    
26. The Call of the Wild, by Jack London
    
27. Go Tell it on the Mountain, by James Baldwin
    
28. All the King's Men, by Robert Penn Warren
    
29. The Lord of the Rings, by J.R.R. Tolkien
    
30. The Jungle, by Upton Sinclair
    
31. Lady Chatterley's Lover, by D.H. Lawrence
    
32. A Clockwork Orange, by Anthony Burgess
    
33. The Awakening, by Kate Chopin
    
34. In Cold Blood, by Truman Capote
    
35. The Satanic Verses, by Salman Rushdie
    
36. Sophie's Choice, by William Styron
    
37. Sons and Lovers, by D.H. Lawrence
    
38. Cat's Cradle, by Kurt Vonnegut
    
39. A Separate Peace, by John Knowles
    
40. Naked Lunch, by William S. Burroughs
    
41. Brideshead Revisited, by Evelyn Waugh
    
42. Women in Love, by D.H. Lawrence
    
43. The Naked and the Dead, by Norman Mailer
    
44. Tropic of Cancer, by Henry Miller
    
45. An American Tragedy, by Theodore Dreiser
    
46. Rabbit, Run, by John Updike