Mo. Rev. Stat. § 574.020
1. A person commits the crime of private peace disturbance if he is on private property and unreasonably and purposely causes alarm to another person or persons on the same premises by:
(L. 1977 S.B. 60)
Effective 1-01-79
*This section was amended by S.B. 491, 2014, effective 1-01-17. Due to the delayed effective date, both versions of this section are printed here.