Question: For the court cases Curtis Publishing Co. v. Butts and Katzenbach v. Morgan, which established First Amendment protections, and which allowed Congress law enactment?
Sentence (from "Curtis Publishing Co. v. Butts"): Curtis Publishing Co. v. Butts, 388 U.S. 130 (1967), was a case in which the Supreme Court of the United States established the standard of First Amendment protection against defamation claims brought by private individuals.
Relevant evidence: Yes