116. The commission, the victim, the group of victims, the complainant before the commission, any person or organization on whom or which an application is served and the person on whom an affirmative action program has been or may be imposed are parties to the application by operation of law and may intervene at any time before the execution of the decision.
Any other person, group or organization may, at any time before the execution of the decision, become a party to the application if the Tribunal is satisfied that he or it has a sufficient interest to intervene; however, the person, group or organization must obtain leave from the Tribunal each time he or it wishes to produce, examine or cross-examine witnesses, or examine any evidence in the record and comment or refute it.