Summary

by John Marshall Harlan Crowley v. United States — Opinion of the Court

A prisoner who is in court, and against whom an indictment is about to be preferred, may undoubtedly challenge for cause; this is not questioned. But the grand jury may find an indictment against a person who is not in court; how is he to avail himself of a defective organization of the grand jury? If he cannot do it by plea, he cannot do it in any way; and the law works unequally by allowing one class of persons to object to the competency of the grand jury, whilst another class has no such privilege.
Source: Wikisource

by John Marshall Harlan Crowley v. United States — Opinion of the Court

It is his right, in the first place, to have the accusation passed upon, before he can be called upon to answer to the charge of crime, by a grand jury composed of good and lawful men. If the jury be not composed of such men as possess the requisite qualifications, he ought not to be put upon his trial upon a charge preferred by them, but should be permitted to plead their incompetency to prefer the charge and put him upon his trial, in avoidance of the indictment.
Source: Wikisource

by John Marshall Harlan Crowley v. United States — Opinion of the Court

Such persons are not present when the grand jurors are impaneled, perhaps have not been made subjects of complaint or even suspicion. It certainly would not be right to estop a party from pleading a matter to which he could not otherwise except. The interest of an accused person under indictment with the grand jury commences at the time of the finding of the indictment. This is the point of time when, as to him, the legal number of qualified men must exist upon the grand inquest. Indictments not found by at least twelve good and lawful men are void at common law.
Source: Wikisource

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