I begin, of course, with Rights against Criminals, founded on sovereignty, with their limitations under the Constitution.

Rebellion is in itself the crime of treason, which is usually called the greatest crime known to the law, containing all other crimes, as the greater contains the less. But neither the magnitude of the crime nor the detestation it inspires can properly move us from duty to the Constitution. Howsoever important it may be to punish rebels, this must not be done at the expense of the Constitution. On that point I agree with the Senator from Pennsylvania [Mr. Cowan], and the Senator from Vermont [Mr. Collamer]; nor will I yield to either in determination to uphold the Constitution, which is the shield of the citizen. Show me that any proposition is without support in the Constitution, or that it offends against any constitutional safeguard, and it cannot receive my vote. Sir, I shall not allow Senators to be more careful on this head than myself. They shall not have a monopoly of this proper caution.

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.

5. In all criminal prosecutions the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the State and District wherein the crime shall have been committed, which District shall have been previously ascertained by law. This is the sixth amendment to the Constitution, and is not to be lost sight of now. The accused, whoever he may be, though his guilt be open as noonday, can be reached criminally only in the way described. When we consider the deep and wide-spread prejudices which must exist throughout the whole Rebel territory, it is difficult to suppose that any jury could be found within the State and District where the treason was committed who would unite in the necessary verdict of Guilty. For myself, I do not expect it; and I renounce the idea of justice in this way. Jefferson Davis himself, whose crime has culminated in Virginia, could not be convicted by a jury of that State. But it is the duty of the statesman to consider how justice, impossible in one way, may be made possible in another way.

6. No attainder of treason shall work corruption of blood, or forfeiture except during the life of the person attainted. Perhaps no provision of the Constitution, supposed pertinent to the present debate, has been more considered; nor is there any with regard to which there is greater difference of opinion. Learned lawyers in this body insist broadly that it forbids forfeiture of real estate, although not of personal, as a penalty of treason; while others insist that all the real as well as personal estate belonging to the offender may be forfeited. The words of the Constitution are technical, so as to require interpretation; and as they are derived from the Common Law, we must look to this law for their meaning. By “attainder of treason” is meant judgment of death for treason,—that is, the judgment of court on conviction of treason. “Upon judgment of death for treason or felony,” says Blackstone, “a man shall be said to be attainted.”[17] Such judgment, which is, of course, a criminal proceeding, cannot, under our Constitution, work corruption of blood; which means that it cannot create obstruction or incapacity in the blood to prevent an innocent heir from tracing title through the criminal, as was cruelly done by the Common Law.