(1)  The Minister may intervene in the public interest or otherwise in any proceedings before the Commission.

(2)  An organization may, with the leave of the Commission, intervene in any proceedings before the Commission.

(3)  The Minister for the time being administering the Commonwealth Act may, on behalf of the Commonwealth, by giving to the Registrar written notice of his intention to do so, and with the leave of the Commission, intervene on behalf of the Commonwealth in any proceedings before the Commission in which that Minister considers that the Commonwealth has a sufficient interest to warrant intervention.

(4)  Subsections (2) and (3) do not apply to proceedings under Part IVA .

(5)  A person having a direct interest in any proceedings before the Commission may apply to the Commission for leave to appear and be heard in those proceedings.

(6)  The Commission, if satisfied that the person has a direct interest in the proceedings before it, must grant an application under subsection (5) .