Mo. Rev. Stat. § 87.010
The municipal authorities by act or ordinance, in all cities, villages or incorporated towns in this state having an organized fire department, may set apart not exceeding fifty percent of all revenue received by such cities, villages or incorporated towns for municipal purposes from licenses issued by them for carrying on the business of a fire insurance company, agent or agency, and not exceeding three percent of all other revenue received by such cities, villages or incorporated towns for municipal purposes from licenses issued by such cities, villages or incorporated towns, as a fund for the pensioning of crippled and disabled members of the fire department, and of the widows and orphans of deceased members of the fire department of such cities, villages or incorporated towns, and the treasurer of such cities, villages or incorporated towns shall be ex officio treasurer of such fund; provided, that in any city other than a city of the first class the provisions of sections 87.010 to 87.105 shall not be in effect until it shall be ratified by a majority of the voters of such city, who vote on the question which shall be submitted at the request of one hundred voters.
§ 87.010, RSMo