Whenever two or more persons assemble together to do an unlawful act, or do a lawful act in a violent, boisterous, or tumultuous manner, such assembly is an unlawful assembly.
Ca. Pen. Code § 407
Whenever two or more persons assemble together to do an unlawful act, or do a lawful act in a violent, boisterous, or tumultuous manner, such assembly is an unlawful assembly.
Ca. Pen. Code § 407