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This is the Insurrection Act of 1807.Its been used by 12 differentpresidents from Jefferson allthe way to George H.W. Bush.One of those occasions was by the Democrathero Lyndon Baines Johnson.He actually brought in themilitary -- guess what? --to put down riots inWashington, D.C, so General Mattis really shouldhave picked up a couple of hishistory books.