Mo. Rev. Stat. § 40.395
Provocative gestures or words, constituting a threat of violence — ...
40.395. Provocative gestures or words, constituting a threat of violence — court-martial. — Any person subject to sections 40.005 to 40.490 who uses provoking or reproachful words or gestures constituting an immediate threat to violence toward any other person subject to sections 40.005 to 40.490 shall be punished as a court-martial may direct.
(L. 1984 H.B. 1035 § 115)