Mo. Rev. Stat. § 429.190
Current with changes from the 2023 Legislative Session
In all suits under sections 429.010 to 429.340 the parties to the contract shall, and all other persons interested in the matter in controversy or in the property charged with the lien may be made parties, but such as are not made parties shall not be bound by any such proceedings.
§ 429.190, RSMo
RSMo 1939 § 3555