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The combination in the same hands of the power to make the laws and the power to carry them out is the essence of arbitrary rule by decree, the founders believed, guided by such writers as the Baron de Montesquieu, John Locke, and William Blackstone. For them, the separation of powers was key to the protection of liberty from such tyranny, Thomas writes. The Constitution vested all legislative power in Congress, all executive power in the president, and all judicial power in the Supreme Court and inferior courts, because the framers did not want to have those powers delegated to other hands, lest it bring about the βgradual concentration of the several powers in the same department,β as Madison put it in Federalist 51.
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