Banned SF Books

Googles banned books page, Google Book Search: Celebrate Your Freedom to Read includes a few SF books:

• 1984 by George Orwell


• Brave New World by Aldous Huxley


• A Clockwork Orange by Anthony Burgess


• Slaughterhouse Five by Kurt Vonnegut


• Cat's Cradle by Kurt Vonnegut

Presumably these books were banned or attempted to be banned in the US, rather than anywhere else in the world. A UK version would be interesting to see if we're more or less tolerant.