MR. JUSTICE FRANKFURTER delivered the opinion of the Court.
On November 10, 1954, the United States Attorney for the Southern District of New York filed an application under the Immunity Act of 1954, 68 Stat. 745, 18 U. S. C. (Supp. II) § 3486, for an order requiring petitioner to testify before a grand jury. The Immunity Act, in its pertinent portions, provides:
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