Felix Frankfurter

“ The fact that the phrase 'national or international labor organization' consists of ordinary English words, which to the ordinary ear may carry a meaning different from that which they carry in the domain of industrial relations, does not destroy our duty to determine whether they do have a technical meaning when used in regard to matters of industrial relations. ”

“ The best source for us in determining whether a term used in the field of industrial relations has a technical connotation is the body to which Congress has committed the administration of the statute. ”