MR. JUSTICE MURPHY delivered the opinion of the Court.
During the course of a grand jury investigation into alleged irregularities in the construction of the Mechanicsburg Naval Supply Depot, the District Court of the United States for the Middle District of Pennsylvania issued a subpoena duces tecum directed to "Local No. 542, International Union of Operating Engineers." This subpoena required the union to produce before the grand jury on January 11, 1943, copies...
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