Summary

Joseph McKenna Hyde v. United States — Opinion of the Court

It seems like a contradiction to say that a thing is necessary to complete another thing, and yet that other thing is complete without it. It seems like a paradox to say that anything, to quote the Solicitor General, 'can be a crime of which no court can take cognizance.' The conspiracy, therefore, cannot alone constitute the offense. It needs the addition of the overt act. Such act is something more, therefore, than evidence of a conspiracy.
Source: Wikisource

Joseph McKenna Hyde v. United States — Opinion of the Court

The overt act is simply evidence that the conspiracy has passed beyond words and is on foot when the act is done. As a test of actuality it is made a condition to punishment, but it is no more a part of the crime than it was at common law, where it was customary to allege such an act; or than is the fact that the statute of limitations has not run.
I can think of no other case in which it would be argued that an act constituting no part of the crime charged draws jurisdiction to the place where it is done.
Source: Wikisource

Joseph McKenna Hyde v. United States — Opinion of the Court

Every overt act done in aid of it, of course, is attributed to the conspirators; and if that means that the conspiracy is present as such wherever any overt act is done, it might be at the choice of the government to prosecute in any one of twenty states in none of which the conspirators had been. And as wherever two or more have united for the commission of a crime there is a conspiracy, the opening to oppression thus made is very wide indeed. It is even wider if success should be held not to merge the conspiracy in the crime intended and achieved.
Source: Wikisource

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