Mo. Rev. Stat. § 574.060: Refusal to disperse — penalty.

1. A person commits the offense of refusal to disperse if, being present at the scene of an unlawful assembly, or at the scene of a riot, he or she knowingly fails or refuses to obey the lawful command of a law enforcement officer to depart from the scene of such unlawful assembly or riot.

2. The offense of refusal to disperse is a class C misdemeanor.