We say that the laws of nature (e.g. Newton's Laws, relativity, ...) must be confirmed and must be checked for invariance (e.g Lorentz, gauge, ...). Yet many of these laws may be directly derived from the principle of least action. Why do we not consider the principle of least action a law of nature; indeed the premiere law? It seems to be the foundation of so much else. Has the principle of least action been subjected to confirmation and invariance tests similar to other laws? Is least action a property of this universe, or of all universes? Is the action necessarily a single valued function? If not, there could be multiple local minima of action, and thus multiple sets of laws.