Advocacy for Principled Action in Government; American-Arab Anti-Discrimination Committee; American Civil Liberties Union; American Library Association; Bill of Rights Defense Committee; Center for Democracy and Technology; Constitutional Alliance; Constitutional Alliance; Cyber Privacy Project; Defending Dissent Foundation; Demand Progress; Electronic Frontier Foundation; Fight for the Future; Free Press Action Fund; Government Accountability Project; National Association of Criminal Defense Lawyers; New America's Open Technology Institute; Niskanen Center; R Street; Restore the Fourth(10/20/2015)