Supreme Court of the United States June 12, 1944, 366 (United States v. White)

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 Mechanics-burg 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.