Here's an interesting story about the Blacklist era. Note especially the link at the end to a copy of the CBS loyalty oath.
I wrote a paper on censorship back in my first year of library school, using as examples Dalton Trumbo's "Johnny Got His Gun" and Kurt Vonnegut's "Slaughterhouse 5."
http://www.vsa-software.com/mlsportfolio/ils503/censorship.doc (Word 2003)
And here are some books on the McCarthy hearings from our collection: