Gibson v. Florida Legislative Investigation Committee, 372 U.S. 539 (1963), was a United States Supreme Court case based on the First Amendment to the U.S. Constitution. It held that a legislative committee cannot compel a subpoenaed witness to give up the membership lists of his organization. External links First Amendment Library entry on Gibson v. Florida Legislative Investigation Committee United States Supreme Court cases United States Supreme Court cases of the Warren Court United States Free Speech Clause case law 1963 in United States case law Civil rights movement case law