Summary

Portrait of Stephen Johnson Field Stephen Johnson Field Mahon v. Justice — Opinion of the Court

If the states of the Union were possessed of an absolute sovereignty, instead of a limited one, they could demand of each other reparation for an unlawful invasion of their territory and the surrender of parties abducted, and of parties committing the offense, and, in case of refusal to comply with the demand, could resort to reprisals, or take any other measures they might deem necessary as redress for the past and security* for the future. But the states of the Union are not absolutely sovereign. Their sovereignty is qualified and limited by the conditions of the Federal constitution.
Source: Wikisource

Portrait of Stephen Johnson Field Stephen Johnson Field Mahon v. Justice — Opinion of the Court

There is no comity between the states by which a person held upon an indictment for a criminal offense in one state can be turned over to the authorities of another, though abducted from the latter. If there were any such comity, its enforcement would not be a matter within the jurisdiction of the courts of the United States. By comity nothing more is meant than that courtesy on the part of one state by which, within her territory, the laws of another state are recognized and enforced, or another state is assisted in the execution of her laws.
Source: Wikisource

Portrait of Stephen Johnson Field Stephen Johnson Field Mahon v. Justice — Opinion of the Court

It is not the surrender of a fugitive from justice which is sought, but the surrender of a citizen unconstitutionally abducted and held in custody. There must be some remedy for such a wrong. It cannot be that the states, in surrendering their right of obtaining redress by military force and reprisals, have no remedy whatever. It was suggested by counsel that the state of West Virginia might sue the state of Kentucky for damages.
Source: Wikisource

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