Edward Douglass White, North Dakota ex rel Flaherty v…
“ But if the mere form in which the burdens imposed by the statute be disregarded and their essence be considered, nevertheless we are of the opinion that the statute must be held to be repugnant to the Constitution of the United States. This follows, because it is clear that, in principle, a state may not so exert its police power as to directly hamper or destroy a lawful authority of the government of the United States. ”
