In any case of adjudication (as defined in section 551 of title 5) which has been designated by the Commission for a hearing, no person who has participated in the presentation or preparation for presentation of such case at the hearing or upon review shall (except to the extent required for the disposition of ex parte matters as authorized by law) directly or indirectly make any additional presentation respecting such case to the hearing officer or officers or to the Commission, or to any authority within the Commission to whom, in such case, review functions have been delegated by the Commission under section 155(d)(1) ¹ of this title, unless upon notice and opportunity for all parties to participate.

The provision in section 554(d) of title 5 which states that such subsection shall not apply in determining applications for initial licenses, shall not be applicable hereafter in the case of applications for initial licenses before the Federal Communications Commission.