lity of the statute or ordinance on which the prosecution is based may be lo determined as readily . criminal case as in suit for an injunction. & Famum Mfg. Co. S. City of Los Angel s, I .S. 207, 23 S.Ct. 498, L.Ed. 778;Fenner Boykin, 271 U.S. 240, 46 S.Ct. 492, 70 L.Ed. 927. Where the threatened