The congress of the United States possesses no power to regulate, or interfere with the domestic concerns, or police of any state: it belongs not to them to establish any rules respecting the rights of property; nor will the constitution permit any prohibition of arms to the people.
William Blackstone, St. George Tucker (1996). “Blackstone's Commentaries: With Notes of Reference to the Constitution and Laws, of the Federal Government of the United States, and of the Commonwealth of Virginia: With an Appendix to Each Volume, Containing Short Tracts Upon Such Subjects as Appeared Necessary to Form a Connecte”, p.315, The Lawbook Exchange, Ltd.