National Coalition Against Censorship
The National Coalition Against Censorship (NCAC), founded in 1974, is an alliance of 50 American non-profit organizations, including literary, artistic, religious, educational, professional, labor, and civil liberties groups. NCAC is a New York–based organization with official 501(c)(3) status in the United States.
Source: Wikipedia — National Coalition Against Censorship (CC BY-SA 4.0)