Summary

Portrait of John Marshall Harlan II John Marshall Harlan II Marchetti v. United States — Opinion of the Court

We emphasize that we do not hold that these wagering tax provisions are as such constitutionally impermissible; we hold only that those who properly assert the constitutional privilege as to these provisions may not be criminally punished for failure to comply with their requirements. If, in different circumstances, a taxpayer is not confronted by substantial hazards of self-incrimination, or if he is otherwise outside the privilege's protection, nothing we decide today would shield him from the various penalties prescribed by the wagering tax statutes.
Source: Wikisource

Portrait of John Marshall Harlan II John Marshall Harlan II Marchetti v. United States — Opinion of the Court

But we are equally obliged to give full effect to the constitutional restrictions which attend the exercise of those powers. We do not, as we have said, doubt Congress' power to tax activities which are, wholly or in part, unlawful. Nor can it be doubted that the privilege against self-incrimination may not properly be asserted if other protection is granted which 'is so broad as to have the same extent in scope and effect' as the privilege itself.
Source: Wikisource

Portrait of John Marshall Harlan II John Marshall Harlan II Marchetti v. United States — Opinion of the Court

Second, whatever 'public aspects' there were to the records at issue in Shapiro, there are none to the information demanded from Marchetti. The Government's anxiety to obtain information known to a private individual does not without more render that information public; if it did, no room would remain for the application of the constitutional privilege. Nor does it stamp information with a public character that the Government has formalized its demands in the attire of a statute; if this alone were sufficient, the constitutional privilege could be entirely abrogated by any Act of Congress.
Source: Wikisource

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