The public utility commission of Ohio refused to permit the plaintiff motor bus company to operate over a portion of the route for which application was made for a certificate. The plaintiff applied to the federal district court for an injunction against enforcement of the commission's order on the ground that it amounted to a deprivation of property without due process. A temporary injunction was granted. Thereafter, the plaintiff took a statutory appeal to the state supreme court, which affirmed the order, after which the plaintiff sought a permanent injunction in the federal court. Held, the decision of the state court on the federal question made the issue res judicata, so the relief sought was denied. Grubb v. Public Utilities Commission, 281 U. S. 470, 50 Sup. Ct. 374, 74 L. ed. 972.