The constitutional right to freedom of speech may ordinarily be limited or restricted by an agency of government

under no circumstances, since the First Amendment says $$no law abridging the freedom of speech.$$

when a police officer deems a public statement to be offensive to public decency.

if the speaker is a member of an organization that has a reputation for violence, such as the Ku Klux Klan.

when an expression poses an imminent threat to public order or to others$$ rights.