The true doctrine, as we conceive, is this, that while the States are really sovereign as to all matters which have not been granted to the jurisdiction and control of the United States, the Constitution and constitutional laws of the latter are, as we have already said, the supreme law of the land, and when they conflict with the laws of the States they are of paramount authority and obligation. This is the fundamental principle on which the authority of the Constitution is based, and unless it be conceded in practice as well as theory the fabric of our institutions, as it was contemplated by its founders, can not stand. The questions involved have respect not more to the autonomy and existence of the States than to the continued existence of the United States as a government to which every American citizen may look for security and protection in every part of the land. * * * Why do we have marshals at all if they can not physically lay their hands on persons and things in the performance of their proper duties? What functions can they perform if they can not use force? In executing the process of the courts must they call on the nearest constable for protection? Must they rely on him to use the requisite compulsion and to keep the peace while they are soliciting and entreating the parties and bystanders to allow the law to take its course? This is the necessary consequence of the positions that are assumed. If we indulge in such impracticable views as these, and keep on refining and re-refining, we shall drive the National Government out of the United States and relegate it to the District of Columbia, or perhaps to some foreign soil. We shall bring it back to a condition of greater helplessness than that of the old Confederation. The argument is based on a strained and impracticable view of the nature and powers of the National Government. It must execute its powers or it is no government. It must execute them on the land as well as on the sea, on things as well as on persons. And to do this it must necessarily have power to command obedience, preserve order, and keep the peace; and no person or power in this land has the right to resist or question its authority so long as it keeps within the bounds of its jurisdiction. I have deemed it fitting and proper to quote thus largely from an important and elaborate opinion of the Supreme Court because the bill before me proceeds upon a construction of the Constitution as to the powers of the National Government which is in direct conflict with the judgment of the highest judicial tribunal of our country.