>>Trouble is though, they've been challenged because they're not politically correct and don't fit in at all with the social engineering the Libs/Socialists/Communists<<
Actually, some think Steinbeck's Grapes was a liberal/socialist manifesto of sorts. I think they are reading their own dreams into to the book, but not all classic works of fiction are criticized by liberals. They just put their own spin on it and go forward. They may not have a lot of use, however, for early western civ philosophy.
True, though the irony is amazing...
I remember hearing it as being a top one on the Banned Books list--which IIRC is compiled by Libs everywhere...