At the same term with the Milligan case the test-oath case from Missouri was brought before the Court and argued. In January, 1865, a convention had assembled in that State to amend its constitution. Its members had been elected in November previous. In April, 1865, the constitution, as revised and amended, was adopted by the convention, and in June following by the people. Elected, as the members were, in the midst of the war, it exhibited throughout traces of the animosities which the war had engendered. By its provisions the most stringent and searching oath as to past conduct known in history was required, not only of officers under it, but of parties holding trusts and pursuing avocations in no way connected with the administration of the government. The oath, divided into its separates parts, contained more than thirty distinct affirmations touching past conduct, and even embraced the expression of sympathies and desires. Every person unable to take the oath was declared incapable of holding, in the State, "any office of honor, trust, or profit under its authority, or of being an officer, councilman, director, or trustee, or other manager of any corporation, public or private, now existing or hereafter established by its authority, or of acting as a professor or teacher in any educational institution, or in any common or other school, or of holding any real estate or other property in trust for the use of any church, religious society, or congregation."

And every person holding, at the time the amended constitution took effect, any of the offices, trusts, or positions mentioned, was required, within sixty days thereafter, to take the oath; and, if he failed to comply with this requirement, it was declared that his office, trust, or position should ipso facto become vacant.

No person, after the expiration of the sixty days, was permitted, without taking the oath, "to practice as an attorney or counsellor-at-law," nor, after that period could "any person be competent as a bishop, priest, deacon, minister, elder, or other clergyman, of any religious persuasion, sect, or denomination, to teach, or preach, or solemnize marriages."

Fine and imprisonment were prescribed as a punishment for holding or exercising any of "the offices, positions, trusts, professions, or functions" specified, without having taken the oath; and false swearing or affirmation in taking it was declared to be perjury, punishable by imprisonment in the penitentiary.

Mr. Cummings of Missouri, a priest of the Roman Catholic Church, was indicted and convicted in one of the Circuit Courts of that State, of the crime of teaching and preaching as a priest and minister of that religious denomination without having first taken the oath thus prescribed, and was sentenced to pay a fine of five hundred dollars and to be committed to jail until the same was paid. On appeal to the Supreme Court of the State the judgment was affirmed, and the case was brought on a writ of error to our court. It was there argued with great learning and ability by Mr. Montgomery Blair, of Washington, Mr. David Dudley Field, of New York, and Mr. Reverdy Johnson, of Maryland, for Mr. Cummings; and by Mr. G.P. Strong and Mr. John B. Henderson, of Missouri, the latter then United States Senator for the State.

It was evident, after a brief consideration of the case, that the power asserted by the State of Missouri to exact this oath for past conduct from parties, as a condition of their continuing to pursue certain professions, or to hold certain trusts, might, if sustained, be often exercised in times of excitement to the oppression, if not ruin, of the citizen. For, if the State could require the oath for the acts mentioned, it might require it for any other acts of one's past life, the number and character of which would depend upon the mere will of its legislature. It might compel one to affirm, under oath, that he had never violated the ten commandments, nor exercised his political rights except in conformity with the views of the existing majority. Indeed, under this kind of legislation, the most flagrant wrongs might be committed and whole classes of people deprived, not only of their political, but of their civil rights.

It is difficult to speak of the whole system of expurgatory oaths for past conduct without a shudder at the suffering and oppression they were not only capable of effecting but often did effect. Such oaths have never been exacted in England, nor on the Continent of Europe; at least I can recall no instance of the kind. Test-oaths there have always been limited to an affirmation on matters of present belief, or as to present disposition towards those in power. It was reserved for the ingenuity of legislators in our country during the civil war to make test-oaths reach to past conduct.

The Court held that enactments of this character, operating, as they did, to deprive parties by legislative decree of existing rights for past conduct, without the formality and the safeguard of a judicial trial, fell within the inhibition of the Constitution against the passage of bills of attainder. In depriving parties of existing rights for past conduct, the provisions of the constitution of Missouri imposed, in effect, a punishment for such conduct. Some of the acts for which such deprivation was imposed were not punishable at the time; and for some this deprivation was added to the punishments previously prescribed, and thus they fell under the further prohibition of the Constitution against the passage of an ex post facto law. The decision of the Court, therefore, was for the discharge of the Catholic priest. The judgment against him was reversed, and the Supreme Court of Missouri was directed to order the inferior court by which he was tried to set him at liberty.

Immediately following the case of Cummings that of Ex-parte Garland was argued, involving the validity of the iron-clad oath, as it was termed, prescribed for attorneys and counsellors-at-law by the act of Congress of January 24th, 1865. Mr. A.H. Garland, now United States Senator from Arkansas, had been a member of the Bar of the Supreme Court of the United States before the civil war. When Arkansas passed her ordinance of secession and joined the Confederate States, he went with her, and was one of her representatives in the Congress of the Confederacy. In July, 1865, he received from the President a full pardon for all offences committed by his participation, direct or implied, in the rebellion. At the following term of the Court he produced his pardon and asked permission to continue to practice as an attorney and counsellor without taking the oath required by the act of Congress, and the rule of the Court made in conformity with it, which he was unable to take by reason of the offices he had held under the Confederate government. The application was argued by Mr. Matthew H. Carpenter, of Wisconsin, and Mr. Reverdy Johnson, of Maryland, for the petitioner—Mr. Garland and Mr. Marr, another applicant for admission, who had participated in the rebellion, filing printed arguments—and by Mr. Speed, of Kentucky, and Mr. Henry Stanbery, the Attorney-General, on the other side. The whole subject of expurgatory oaths was discussed, and all that could be said on either side was fully and elaborately presented.

The Court in its decision followed the reasoning of the Cummings case and held the law invalid, as applied to the exercise of the petitioner's right to practice his profession; that such right was not a mere indulgence, a matter of grace and favor, revocable at the pleasure of the Court, or at the command of the legislature; but was a right of which the petitioner could be deprived only by the judgment of the Court for moral or professional delinquency. The Court also held that the pardon of the petitioner released him from all penalties and disabilities attached to the offence of treason committed by his participation in the rebellion, and that, so far as that offence was concerned, he was placed beyond the reach of punishment of any kind. But to exclude him by reason of that offence—that is, by requiring him to take an oath that he had never committed it—was to enforce a punishment for it notwithstanding the pardon; and that it was not within the constitutional power of Congress thus to inflict punishment beyond the reach of executive clemency.