Noerr–Pennington doctrine
Under the Noerr–Pennington doctrine, private entities are immune from liability under the antitrust laws for attempts to influence the passage or enforcement of laws, even if the laws they advocate for would have anticompetitive effects. The doctrine is grounded in the First Amendment protection of political speech, and "upon a recognition that the antitrust laws, 'tailored as they are for the business world, are not at all appropriate for application in the political arena.'"