It shall be unlawful for any two or more persons to assemble together within the city with the intent to do any unlawful act by force or violence against the city, or against any other person, or to do any unlawful acts against the public peace, quiet, security or repose of any person within the city, or being unlawfully assembled to agree with each other to do, or without agreement to do, or by words, signs or otherwise make any preparation or movement to do any unlawful act or acts as set out in this section.
(1964 Code, § 15-19)