Free Speech Primary Sources
Oyez, a searchable database of United States Supreme Court cases, provides audio files of the oral arguments and links to written opinions.
A number of the documents lying at the center of historic First Amendment cases such as Schenck's and Abrams's pamphlets, Gitlow's manifesto and the student articles from the Hazelwood East High School newspaper are available here.
Tunis Wortman's far-sighted Treatise Concerning Political Inquiry and the Liberty of the Press is available here.
This site provides text transcripts (as well as audio and video files) of many of the most important speeches in American history.