The Electronic Frontier Foundation was founded in July of 1990 in response to a basic threat to speech. The United States Secret Service conducted a series of raids tracking the distribution of a document illegally copied from a BellSouth computer that described how the emergency 911 system worked, referred to as the E911 document. The Secret Service believed that if "hackers" knew how to use the telephone lines set aside for receiving emergency phone calls, the lines would become overloaded and people facing true emergencies would be unable to get through.
One of the alleged recipients of the E911 document was the systems operator at a small games book publisher out of Austin, Texas, named Steve Jackson Games. The Secret Service executed a warrant against the innocent Jackson and took all electronic equipment and copies of an upcoming game book from Steve Jackson Games' premises. Steve Jackson panicked as he watched the deadline come and go for his latest release and still hadn't received his computers back. He was forced to lay off nearly half of his staff. In the end, the Secret Service returned all of Steve Jackson's computers and decided not to press charges against the company, since they were unable to find any copies of the E911 document on any of the computers.In the meantime, Steve Jackson's business was nearly ruined. And when he and his employees had the opportunity to investigate the returned computers, they noticed that all of the electronic mail that had been stored on the company's electronic bulletin board computer, where non-employee users had dialed in and sent personal messages to one another, had been individually accessed and deleted. Steve Jackson was furious, as he believed his rights as a publisher had been violated and the free speech and privacy rights of his users had been violated. Steve Jackson tried desperately to find a civil liberties group to help him, to no avail. Unfortunately, none of the existing groups understood the technology well enough to understand the importance of the issues.
In an electronic community called the Whole Earth 'Lectronic Link (now WELL.com) several informed technologists understood exactly what civil liberties issues were involved. Mitch Kapor, former president of Lotus Development Corporation, John Perry Barlow, Wyoming cattle rancher and lyricist for the Grateful Dead, and John Gilmore, an early employee of Sun Microsystems, decided to do something about it. They formed an organization to work on civil liberties issues raised by new technologies. On the day they formally unveiled the new organization, they announced that they were representing Steve Jackson Games and several of the company's bulletin board users in a lawsuit they were bringing against the United States Secret Service. The Electronic Frontier Foundation was born!
https://www.eff.org/about/history