The District Court was directed on the remand also to determine whether the activities of the complainants were performed to such an extent beyond the hours fixed by the statute so as to entitle the complainants to overtime compensation. See Hawkins v. E.I. Du Pont De Nemours Co., 4 Cir., 192 F.2d 294. It was alleged in the affidavits presented to this court on the first appeal that the plant was completely fenced in and that the employees were not allowed during their work shift to leave the plant except for good cause shown, and that the cafeteria was the only place for them to eat.