Any person desiring to intervene in any proceeding shall file a motion in writing or, if made at the hearing, may move orally on the record, stating the grounds upon which such person claims an interest. Prior to the hearing, such a motion shall be filed with the regional director issuing the complaint; during the hearing such motion shall be made to the administrative law judge. An original and four copies of written motions shall be filed. Immediately upon filing such motion, the moving party shall serve a copy thereof upon each of the other parties. The regional director shall rule upon all such motions filed prior to the hearing, and shall cause a copy of said rulings to be served upon each of the other parties, or may refer the motion to the administrative law judge for ruling. The administrative law judge shall rule upon all such motions made at the hearing or referred to him by the regional director, in the manner set forth in Sec. 102.25. The regional director or the administrative law judge, as the case may be, may by order permit intervention in person or by counsel or other representative to such extent and upon such terms as he may deem proper.
Witnesses, Depositions, and Subpoenas