JUSTICE MARSHALL delivered the opinion of the Court.
The question presented in this case is whether the Internal Revenue Service (IRS) must comply with the "John Doe" summons procedures of § 7609(f) of the Internal Revenue Code of 1954, 26 U. S. C. § 7609(f), when it serves a summons on a named taxpayer for the dual purpose of investigating both the tax liability of that taxpayer and the tax liabilities of other, unnamed parties.
I
Petitioner...
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