“ The Bureau was not apprised of Gregory's activities until November of 1945 and the inquiry since that time has been largely the development of information which might serve in corroboration of an alleged relationship between members of the so-called Silvermaster group, the Perlo group, as well as others. We have established since November of 1945 the fact that there exists a fraternal and intimate social bond among those individuals who, according to Gregory, were active more or less in concert prior to November of 1945 in supplying the informant data from various Government agencies. ”

“ From the standpoint of the Registration Act, this case presents a substantial question of agency. Gregory was the agent of Golos and his successors for the purpose of obtaining the information and Silvermaster, Perlo, and their cohorts could be no more, but who is their principal? Was the principal a foreign government? Was the principal a "foreign principal?" What we can prove here again falls far short of what we know. I don’t think the evidence available is sufficient to Prove the agency that is a requisite to a violation. ”

“ We have an informant in this case referred to as Gregory who appears to be unusually intelligent and has related in detail of activities on the part of various individuals, in the main employees or past employees of the United States Government, which activities, if corroborated, would probably support a successful prosecution under existing statutes. ”

“ The odds are not too good that such interviews would terminate successfully; however, it is quite possible that some of the lesser lights among the subjects would crack during the course of a careful and pointed interview. ”