Party means:

(a) Any labor organization, employing agency or activity or individual filing a charge, petition, or request;

(b) Any labor organization or agency or activity

(1) Named as

(i) A charged party in a charge,

(ii) A respondent in a complaint, or

(iii) An employing agency or activity or an incumbent labor organization in a petition;

(2) Whose intervention in a proceeding has been permitted or directed by the Authority; or

(3) Who participated as a party

(i) In a matter that was decided by an agency head under 5 U.S.C. 7117,or; and

(c) The General Counsel, or the General Counsel's designated representative, in appropriate proceedings.