US Presidency
1917

An alien enemy whom there may be reasonable cause to believe to be aiding or about to aid the enemy, or who may be at large to the danger of the public peace or safety, or who violates or attempts to violate, or of whom there is reasonable ground to believe that he is about to violate, any regulation duly promulgated by the President, or any criminal law of the United States, or of the States or Territories thereof, will be subject to summary arrest by the United States Marshal, or his deputy, or such other officer as the President shall designate, and to confinement in such penitentiary, prison, jail, military camp, or other place of detention as may be directed by the President. This proclamation and the regulations herein contained shall extend and apply to all land and water, continental or insular, in any way within the jurisdiction of the United States. In witness whereof, I have hereunto set my hand and caused the seal of the United States to be affixed.