American Civil Liberties Union - The ACLU, a nonprofit, nonpartisan, 275,000-member public interest organization devoted to protecting civil liberties, has led the court fight against the Communications Decency Act..
Citizens Internet Empowerment Coalition - CIEC is a coalition of Internet users, businesses, non-profit groups, and civil liberties advocates that filed suit against the CDA on February 26, 1996 (ALA vs. DOJ). The suit was consolidated with ACLU vs. Reno.
Electronic Frontier Foundation - The EFF is a non-profit organization dedicated to promoting civil liberties in new media.
Center For Democracy and Technology (CDT) - CDT is a non-profit public interest organization dedicated to "constitutional civil liberties and democratic values in new computer and communications technologies."