“ Rule 42 of Fed.Rules Crim.Proc. (governing the contempt power) . We therefore hold that the order was unjustified and that it constituted an unwarranted burden upon defendant and his counsel in the conduct of the case. ”

“ Petitioner contended that his incarceration was unjustified and that it materially interfered with his right to counsel and severely impeded his defense. The Court of Appeals for the Seventh Circuit affirmed the conviction. 374 F.2d 744 (1967) . We grant certiorari and reverse.
A trial judge indisputably has broad powers to ensure the orderly and expeditious progress of a trial. For this purpose, he has the power to revoke bail and to remit the defendant to custody. But this power must be exercised with circumspection. ”