No public employee, and no student in a public educational institution, shall by word of mouth or writing knowingly or wilfully advocate, abet, advise, or teach, the duty, necessity, desirability, or propriety, of overthrowing or destroying the government of the United States or of any state or of any political subdivision thereof, by force, violence, or any other unlawful means, or the adherence to the government of any foreign nation in the event of war between the United States and such foreign government.
La. Public Officers and Employees § 42:54