(a) No person shall congregate with others on the sidewalk, street corner or within the parks or public grounds, with intent to provoke a breach of the peace or whereby a breach of the peace may be occasioned by the serious annoyance to pedestrians or by threatening, insulting or abusive conduct, and refuse to move on when ordered by a police officer.
(b) Whoever violates this section is guilty of unlawful congregation, a minor misdemeanor.