Mo. Rev. Stat. § 521.400
Current with changes from the 2023 Legislative Session
When there are two or more defendants in attachment, and the property, effects or credits of part of them are attached by garnishment, and the others are not summoned, the plaintiff may, at his option, proceed against those whose property, effects or credits have been attached, or continue the cause, and sue out new process against the other defendants; but when the property of one or more of the defendants has been actually seized or secured by bond, the cause shall not be delayed for the purpose of suing out new process against the other defendants, unless, for cause, the court so order.
§ 521.400, RSMo
RSMo 1939 § 1476