National Labor Relations Board v. Erie Resistor Corp. , 83 S. Ct. 1139 ( 1963 )
National Labor Relations Board v. MacKay Radio & Telegraph Co. , 58 S. Ct. 904 ( 1938 )
National Labor Relations Board v. Harry F. Berggren & Sons, Inc. , 406 F.2d 239 ( 1969 )