Hague v. C.I.O., 307 U.S. 496 (1939).
The United States Supreme Court held that citizens have a "guaranteed access" to streets, parks, and other "traditional public forum." The privilege to use the streets and parks for communication of views may be regulated in the best interests of all, but it must not, under the guise of regulation, be abridged or denied. Mere inconvenience to the government will not outweigh free speech interests. The government must use the least restrictive means of achieving legitimate, content neutral objectives.
Ward v. Rock Against Racism, 491 U.S. 781 (1989). Time, place and manner regulations must be narrowly tailored and must not be substantially broader than necessary to achieve a significant government interest.
The United States Supreme Court did not allow cities to completely forbid leaflet distribution in order to prevent littering. The objective of keeping the streets clean does not outweigh the right to distribute literature in public.
The United States Supreme Court did not allow a permit to include any restrictions on a speaker's right of free expression. Permits may not be used as a prior restraint on free speech activities. Inappropriate or illegal activities may only be punished after they have occurred.
Hecklers may not be allowed to veto a speaker's right of free speech. Police must control a crowd rather than arrest the speaker in order to maintain order. Regulations may be imposed on free speech to control traffic flow.
Free speech expression may be regulated for noise content in appropriate places such as hospitals or schools while classes are in session. The general test is to ask whether the expressive activity is basically incompatible with the normal activities of a particular place at a particular time. Unamplified speech is permissible for "street preachers" on public streets.
IMPORTANT NOTE: This is not intended to be, and does not constitute, the giving of legal advice. It is only a summary of the legal rights of U. S. citizens.
It's important that one understand and be aware of decisions by the U. S. Supreme Court.