The term party, except as otherwise provided in this Chapter, shall mean any public employee, employee organization or public employer filing a charge, petition or application under the act or this Chapter; any public employee, employee organization or public employer named as a party in a charge, petition or application filed under the act or this Chapter; or any other public employee, employee organization or public employer whose timely motion to intervene in a proceeding has been granted.
N.Y. Comp. Codes R. & Regs. Tit. 4 § 200.6