In Dickinson v. United States, 346 U.S. 389, 74 S.Ct. 152, 98 L.Ed. 132 (1953), the local Selective Service Board, as fact-finder, denied an exemption contra to the oral and documentary evidence presented by the registrant that he was regularly engaged in his calling as a minister. The Court stated that the "dismissal of the claim solely on the basis of suspicion and speculation is both contrary to the spirit of the Act and foreign to our concepts of justice." Id. at 397, 74 S.Ct. at 158.