Summary

Portrait of William Howard Taft William Howard Taft Ponzi v. Fessenden — Opinion of the Court

Ct. 355, 28 L. Ed. 390, as follows:
'The forbearance which courts of co-ordinate jurisdiction, administered under a single system, exercise towards each other, whereby conflicts are avoided, by avoiding interference with the process of each other, is a principle of comity, with perhaps no higher sanction than the utility which comes from concord; but between state courts and those of the United States it is something more. It is a principle of right and of law, and therefore, of necessity. It leaves nothing to discretion or mere convenience.
Source: Wikisource

Portrait of William Howard Taft William Howard Taft Ponzi v. Fessenden — Opinion of the Court

One accused of crime has a right to a full and fair trial according to the law of the government whose sovereignty he is alleged to have offended, but he has no more than that. He should not be permitted to use the machinery of one sovereignty to obstruct his trial in the courts of the other, unless the necessary operation of such machinery prevents his having a fair trial. He may not complain if one sovereignty waives its strict right to exclusive custody of him for vindication of its laws in order that the other may also subject him to conviction of crime against it.
Source: Wikisource

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