In UAW v. NLRB, 231 F.2d 237 (7th Cir.), cert. denied, 352 U.S. 908, 77 S.Ct. 146, 1 L.Ed.2d 117 (1956), we required that a charging party be allowed to submit evidence in a full hearing on its objections to a proposed settlement where the disagreement concerned a stipulation of facts upon which the settlement was based.