The Mayor, shall if he deems it necessary in order to compel compliance with this chapter, conduct any investigations, inquiries, and for that purpose shall have the full power to subpoena any witnesses, or any persons connected in any way with the aforesaid solicitation and/or selling. Failure of any person or persons so subpoenaed or requested to appear for inquiry by the aforesaid Mayor shall be sufficient grounds for the refusal of the license by the Mayor. (Ord. 1073. Passed 11-14-68.)