Party means any person, employee, group of employees, labor organization, Department, activity or agency:
(a) Filing a complaint, petition, request, or application;(b) Named in a complaint, petition, request, or application; or(c) Whose intervention in a proceeding has been permitted or directed by the Director, Chief Administrative Law Judge, or Administrative Law Judge, as the case may be.
29 C.F.R. §457.19
50 FR 31311, Aug. 1, 1985, as amended at 78 FR 8026 , Feb. 5, 2013