“ It is therefore the duty of a district judge, to whom an application for an injunction restraining the enforcement of a state statute or order is made, to scrutinize the bill of complaint to ascertain whether a substantial federal question is presented, as otherwise the provision for the convening of a court of three judges is not applicable. ”

“ See Isbrandtsen-Moller Company v. United States, 300 U.S. 139, 145, 57 S.Ct. 407, 410, 81 L.Ed. 562. In the absence of a substantial federal question, the court ruled that the charge that the bonds of the city were invalid under the state law presented a purely local issue which the court was not required to consider.
We are of the opinion that these rulings were correct. We have held that section 266 of the Judicial Code, 28 U.S.C.A. § 380, does not apply unless there is a substantial claim of the unconstitutionality of a state statute or administrative order as there described. ”