Rufus Wheeler Peckham, United States v. Gettysburg Electric Railway Company…
“ And also, in our judgment, the government has the constitutional power to condemn the land for the proposed use. It is, of course, not necessary that the power of condemnation for such purpose be expressly given by the constitution. The right to condemn at all is not so given. It results from the powers that are given, and it is implied because of its necessity, or because it is appropriate in exercising those powers. Congress has power to declare war, and to create and equip armies and navies. It has the great power of taxation, to be exercised for the common defense and general welfare. ”
