Party means
(a) any person:
(1) Filing a charge, petition, or request;
(2) named in a charge, complaint, petition, or request;
(3) whose intervention in a proceeding has been permitted or directed by the Board;
(4) who participated as a party
(i) in a matter that was decided by an agency head under 22 U.S.C. 4105 or
(ii) in a matter where action by the Grievance Board was taken; and
(b) the General Counsel, or the General Counsel's designated representative, in appropriate proceedings.