Another infographic from Good.is, this time on the most controversial books in the US.
Interactive mage link. Article/info link.
If you want a longer list, try the ALA site section about banned/challenged books.
One creative Australian teacher librarian of my acquaintance set up a display of banned books in her school library - To Kill a Mockingbird etc - items readily available in her library but which had been subject to censorship/challenge historically/currently. They were borrowed with great alacrity, and all sorts of interesting discussions ensued, in her student reading circle and beyond. I haven't tried this one yet, but it's on my list... Maybe a co-operative venture with the English staff?