Fred M. Vinson,
United States v. Bryan — Opinion of the Court
“ The offense of contempt of Congress, with which we are presently concerned, on the other hand, matures only when the witness is called to appear before the committee to answer questions or produce documents and wilfully fails to do so. Until that moment he has committed no crime. There is, in our jurisprudence, no doctrine of 'anticipatory contempt.' While the witness' testimony may show that he has elected to perjure himself or commit contempt, he does not thereby admit his guilt of some past crime about which he has been summoned for questioning but commits the criminal act then and there. ”
