In National Labor Relations Board v. Pennsylvania Greyhound Lines, Inc., 303 U.S. 261, 58 S.Ct. 571, 572, 82 L.Ed. 831, 115 A.L.R. 307, three related corporations were involved. The two respondents claimed that the third corporation was the `employer'.
In Federal Trade Comm'n v. Goodyear Tire Rubber Co., 304 U.S. 257; J. I. Case Co. v. Labor Board, 321 U.S. 332, relied upon by appellants, the party supporting the validity of the order called into question contended that the order was necessary and its validity should be reviewed.