National Coalition Against Censorship
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The National Coalition Against Censorship (NCAC), founded in 1974, is an alliance of 50 national non-profit organizations, including literary, artistic, religious, educational, professional, labor, and civil liberties groups. United by a conviction that freedom of thought, inquiry, and expression must be defended, they work to educate their members and the public at large about the dangers of censorship and how to oppose them.
Their website contains reports of censorship incidents, analysis and discussion of free expression issues, a database of legal cases in the arts, an archive of NCAC's quarterly newsletter, among other things.