D was a witness before a grand jury and refused to answer certain questions on the ground of self-incrimination. D and the grand jury were brought before the District Court which directed him to answer the questions propounded before the grand jury, stating that D would receive immunity from prosecution. D refused and was again asked by the judge to answer, and he refused on the ground of privilege. P requested that D be found in contempt of court 'under Rule 42 (a).' D protested and requested an adjournment and a public hearing where he would be permitted to call witnesses. That motion was denied. D was adjudged guilty of criminal contempt, imposing a sentence of one year's imprisonment. The Court of Appeal affirmed. The Supreme Court granted certiorari.