The findings of fact by the Secretary of Labor, if supported by substantial evidence, shall be conclusive; but the court, for good cause shown, may remand the case to the Secretary of Labor to take further evidence and the Secretary of Labor may thereupon make new or modified findings of fact and may modify his previous action, and shall certify to the court the record of the further proceedings. Such new or modified findings of fact shall likewise be conclusive if supported by substantial evidence.
The court shall have jurisdiction to affirm the action of the Secretary of Labor or to set it aside, in whole or in part. The judgment of the court shall be subject to review by the Supreme Court of the United States upon certiorari or certification as provided in section 1254 of title 28.