ACLU: Free the Net Campaign

"The ACLU's fight against Internet censorship stretches back a decade. Congress first attempted to censor the Internet in 1996, when it passed the Communications Decency Act. The law criminalized "indecent" speech online. The ACLU sued, arguing that the law abridged the First Amendment. All nine Supreme Court justices agreed and struck down the law. For the first time, in ACLU v. Reno, the Supreme Court recognized that online speech deserves full First Amendment protection. "

From here