"Free Speech" does not guarantee your employment; it promises you wont be arrested, usually; any combination of words can be interpreted as a threat.

Pretty sure it's supposed to prevent the FCC commissioner from threatening to pull your license though unless you fire a particular individual though.

The First Amendment protects people against much more than criminal prosecution. Cases I recommend you read include:

Hustler Magazine, Inc. v. Falwell, 485 U.S. 46

Simon & Schuster, Inc. v. Members of New York State Crime Victims Board, 502 U.S. 105

The New York Times v. Sullivan, 376 U.S. 254, 84 S.Ct. 710, 11 L.Ed.2d. 686 (1964)

Gertz v. Robert Welch, Inc., 418 U.S. 323, 94 S.Ct. 2997, 41 L.Ed.2d. 789 (1974)