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Silencing the Net: The Threat to Freedom of Expression On-line
A May 1996 report from Human Rights Watch that documents attempts around the world, from China to the United States, to limit free speece and privacy on the Internet.
The Right To Anonymous Speech
It has become an issue on the Internet but as long ago as 1962, the U.S. Supreme Court said (Talley v. California) that people had the right to anonymous speech. This is that ruling.
Organizations Specializing in Privacy & Free Speech on the Net
CDT - Center for Democracy and Technology
CPSR - Computer Professionals for Social Responsibility
EFF - Electronic Frontier Foundation
EPIC - Electronic Privacy Information Center
GILC - Global Internet Liberty Campaign
IPC - Internet Privacy Coalition
PI - Privacy International
PRC - Privacy Rights Clearinghouse
...and there is Professor Eugene Vololkh who has a lot at his website on this subject:
http://www.law.ucla.edu/volokh/Good luck