Mo. Rev. Stat. § 352.010

Any number of persons not less than three, who shall have associated themselves by articles of agreement in writing, as a society, company, association or organization formed for benevolent, religious, scientific, fraternal-beneficial, or educational purposes, may be consolidated and united into a corporation. Such articles of agreement may be organic regulations, or a constitution, or other form of association, and any corporate name, not already assumed by another corporation, may be chosen as the title of the corporation; provided, always, that the purpose and scope of the association be clearly and fully set forth.