Hugo Black

“ I agree that mandamus is an extraordinary remedy which should not be issued except in extraordinary circumstances. And I also realize that sometimes the granting of mandamus may bring about the review of a case as would an appeal. Yet this does not deprive a court of its power to issue the writ. Where there are extraordinary circumstances, mandamus may be used to review an interlocutory order which is by no means 'final' and thus appealable under federal statutes. Finality, then, while relevant to the right of appeal, is not determinative of the question when to issue mandamus. ”