Constitutional questions may, of course, also be raised in the normal case of appeals involving individual litigants, governments, government agencies or crown corporations. In such cases the federal and provincial governments must be notified of any constitutional questions and may intervene to submit a brief and attend oral argument at the Court. Usually the other governments are given the right to argue their case in the Court, although on rare occasions this has been curtailed and prevented by order of one of the Court's judges.