Mo. Rev. Stat. § 574.010: Peace disturbance — penalty.

1. A person commits the offense of peace disturbance if he or she:

(1) Unreasonably and knowingly disturbs or alarms another person or persons by:

(a) Loud noise; or

(b) Offensive language addressed in a face-to-face manner to a specific individual and uttered under circumstances which are likely to produce an immediate violent response from a reasonable recipient; or

(c) Threatening to commit a felonious act against any person under circumstances which are likely to cause a reasonable person to fear that such threat may be carried out; or

(d) Fighting; or

(e) Creating a noxious and offensive odor;

(2) Is in a public place or on private property of another without consent and purposely causes inconvenience to another person or persons by unreasonably and physically obstructing:

(a) Vehicular or pedestrian traffic; or

(b) The free ingress or egress to or from a public or private place.

2. The offense of peace disturbance is a class B misdemeanor upon the first conviction. Upon a second or subsequent conviction, peace disturbance is a class A misdemeanor. Upon a third or subsequent conviction, a person shall be sentenced to pay a fine of no less than one thousand dollars and no more than five thousand dollars.