“ The Court of Appeals affirmed all the conspiracy convictions; and, with some exception for petitioner Roberts and two other defendants, that court also affirmed the convictions for the substantive offenses. 342 F.2d 147. Four defendants petitioned for writs of certiorari, and a fifth defendant subsequently moved to be added as a co-petitioner in one of the petitions already filed (No. 234) . We grant that motion ”