Controversial novels--what do you think?

Over the years there have been wonderful literary works introduced to us and then many have been taken away due to one reason or another.  What do all of you think?  I'm going to list these works here and you can comment on them.  Tell us whether or not you think they should be banned and why.

Number one, and I can't believe this book was banned, but here it is:

Yes, the Adventures of Huckleberry Finn by Mark Twain was banned for being "trash only suitable for the slums" according to Concord public library.

Merriam Webster and American Heritage Dictionaries were banned in California elementary schools in 2010 for having the definition for "oral sex" listed in them.

Grapes of Wrath had been and often is banned  due to obscenity as well as for painting the country in a negative light.

James and the giant peach was banned due to violence and obscenity.

Now there are many, many more that can be added to this list, but I'll start with these for the time being. If you would like to list one here and whether or not you agree with it being banned, please do so.  

Let us all know what your thoughts are on these books. We really want to know.