are involved has long been recognized as a valid exercise of the police power (Sunset Amusement Co. v. Board of Police Commissioners (1972) 7 Cal.3d 64, 72 [101 Cal.Rptr. 768, 496 P.2d 840]; Burton v. Municipal Court (1968) 68 Cal.2d 684, 690 [68 Cal.Rptr. 721, 441 P.2d 281]), the standards governing the issuance or denial of such a permit have been subjected to “strict scrutiny.” (Sunset Amusement Co. v. Board of Police Commissioners, supra; see e.g., Perrine v. Municipal Court (1971) 5 Cal.3d 656, 661-665 [97 Cal.Rptr. 320, 488 P.2d 648]; Dillon v. Municipal Court (1971) 4 Cal.3d 860, 866 [94 Cal.Rptr. *777, 484 P.2d 945]; Burton v. Municipal Court, supra,* 68 Cal.2d at pp. 690-697.)
The denial of a permit is a total prior restraint upon a person’s engaging in a First Amendment protected activity. Though a system of prior restraint is not unconstitutional per se, the United States Supreme Court has consistently held that such a system comes to a court “ ‘bearing a heavy presumption against its constitutional validity.’ ”
(Southeastern Promotions, Ltd. v. Conrad (1975) 420 U.S. 546, 558 [43 L.Ed.2d 448, 459, 95 S.Ct. 1239];
New York Times Co. v.
United States (1971) 403 U.S. 713, 714 [29 L.Ed.2d 822, 824-825, 91 S.Ct. 2140];
Bantam Books, Inc. v.
Sullivan (1963) 372 U.S. 58, 70 [9 L.Ed.2d 584, 593, 83 S.Ct. 631]; see also
Near v.
Minnesota (1931) 283 U.S. 697, 716 [75 L.Ed. 1357, 1367-1368, 51 S.Ct. 625].)
Where, as here, an ordinance mandates denial of a license to conduct a First Amendment related business on the basis of prior misconduct, such a disqualification provision can only be sustained if there is a clear and present danger that serious substantive evil would result from granting that license.
In Perrine v. Municipal Court, supra, 5 Cal.3d 656, our Supreme Court held that “it is constitutionally impermissible to deny an applicant a license to operate a bookstore solely upon the ground that he has suffered a prior criminal conviction.” (Id., at p. 659.) The court invalidated a Los Angeles County licensing ordinance that authorized disqualification, among other things, for past criminal convictions of sex crimes, crimes of violence and crimes involving obscenity. In response to the contention that the commission lawfully denied Perrine’s application for a license on the basis of his conviction of an obscenity offense (Pen. Code, § 311.2), which was reasonably related to the operation of a book store, our Supreme Court stated (5 Cal.3d at pp. 664-665): “[S]ince a denial of a license would prohibit petitioner from engaging in an activity protected by the First Amendment, it could only be justified, even under a narrowly