Mo. Rev. Stat. § 574.040 : — CRIMES AND PUNISHMENT; PEACE OFFICERS AND PUBLIC DEFENDERSOffenses Against Public Order — Unlawful assembly - penalty TEXT PDF 1. A person commits the offense of unlawful assembly if he or she knowingly assembles with six or more other persons and agrees with such persons to violate any of the criminal laws of this state or of the United States with force or violence. 2. The offense of unlawful assembly is a class B misdemeanor. § 574.040, RSMo Amended by 2014 Mo. Laws, SB 491,s A, eff. 1/1/2017. L. 1977 S.B. 60 Effective 1-1-79