In Elfbrandt v. Russell, the U.S. Supreme Court invalidates an Arizona law requiring state employees to take a loyalty oath. Anyone who took the oath and then became a member of the Communist Party or any other group that advocated the violent overthrow of the government could be prosecuted for perjury and fired. The Court says the law violates the due process clause by infringing on the right of free association. The Court holds that the law is too broad by punishing a person who joins a group that has both legal and illegal purposes but does not subscribe to the illegal purpose.