In Deering Milliken, Inc. v. Johnson, 295 F.2d 856 (4th Cir. 1961), the Fourth Circuit used § 10(a) of the APA, now 5 U.S.C. § 702 (1976), to enjoin a regional director of the National Labor Relations Board from proceeding with hearings which the court found would unnecessarily delay final resolution of a labor dispute.