Summary

Portrait of Hugo Black Hugo Black In re Murchison — Opinion of the Court

It would be very strange if our system of law permitted a judge to act as a grand jury and then try the very persons accused as a result of his investigations. Perhaps no State has ever forced a defendant to accept grand jurors as proper trial jurors to pass on charges growing out of their hearings. [7] A single 'judge-grand jury' is even more a part of the accusatory process than an ordinary lay grand juror. Having been a part of that process a judge cannot be, in the very nature of things, wholly disinterested in the conviction or acquittal of those accused.
Source: Wikisource

Portrait of Hugo Black Hugo Black In re Murchison — Opinion of the Court

The view we take makes it unnecessary for us to consider or decide any of those questions except the due process challenge to trial by the judge who had conducted the secret 'one-man grand jury' proceedings. [6]
A fair trial in a fair tribunal is a basic requirement of due process. Fairness of course requires an absence of actual bias in the trial of cases. But our system of law has always endeavored to prevent even the probability of unfairness. To this end no man can be a judge in his own case and no man is permitted to try cases where he has an interest in the outcome.
Source: Wikisource

Portrait of Hugo Black Hugo Black In re Murchison — Opinion of the Court

It is one thing to hold that a judge has too great an interest in a case to permit the rendition of a fair verdict when his compensation is determined by the result he reaches. It is quite another thing to disqualify a state judge as having too great an interest to render a due process judgment when his sole interest, as shown by this record, is the maintenance of order and decorum in the investigation of crime-an interest which he shares in common with all judges who punish for contempt.
Source: Wikisource

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