The respondent, a citizen of Florida, owns a former United States Navy submarine which he exhibits for profit. *53 In 1940 he brought it to New York City and moored it at a State pier in the East River. He prepared and printed a handbill advertising the boat and soliciting visitors for a stated admission fee. On his attempting to distribute the bill in the city streets, he was advised by the petitioner, as Police Commissioner, that this activity would violate § 318 of the Sanitary Code, which forbids distribution in the streets of commercial and business advertising matter,[1] but was told that he might freely distribute handbills solely devoted to "information or a public protest."