In proceedings against criminals there are provisions or principles of the Constitution which cannot be disregarded. I will enumerate them, and endeavor to explain their true character. 1. Congress, it is said, has no power under the Constitution over Slavery in the States. This popular principle of Constitutional Law, which is without foundation in the positive text of the Constitution, is adduced against all propositions to free the slaves of Rebels. But this is an obvious misapplication of the alleged principle, which simply means that Congress has no direct power over Slavery in the States, so as to abolish or limit it. For no careful person, whose opinion is of any value, ever attributed to the pretended property in slaves an immunity from forfeiture or confiscation not accorded to other property; and this is a complete answer to the argument on this head. Even in prohibiting Slavery, as in the Jeffersonian ordinance, there is a declared exception of the penalty of crime; and so in upholding Slavery in the States, there must be a tacit, but unquestionable, exception of this penalty. 2. There must be no _ex post facto_ law; which means that there can be no law against crime retrospective in its effect. This is clear. 3. There must be no bill of attainder; which means that there can be no special legislation, where Congress, undertaking the double function of legislature and judge, shall inflict the punishment of death without conviction by due process of law. And there is authority for assuming that this prohibition includes a bill of pains and penalties, which is a milder form of legislative attainder, where the punishment inflicted is less than death.[16] And surely no constitutional principle is more worthy of recognition. 4. No person shall be deprived of life, liberty, or property, without due process of law; which means, without presentment, or other judicial proceeding. This provision, borrowed from Magna Charta, constitutes a safeguard for all: nor can it be invoked by the criminal more than by the slave; for in our Constitution it is applicable to every “person,” without distinction of condition or color. But the criminal is entitled to its protection.