R 423.157 Joinder of parties.

Rule 157. Persons having such an interest in the subject of the action that their presence in the action is essential to permit the commission to render complete relief shall be made parties and aligned as charging parties or respondents in accordance with their respective interests. If the persons have not been made parties, then the commission or administrative law judge shall, on motion of either party, order them to appear in the action, and may prescribe the time and order of pleading.