TOP SECRET
IV. PROSECUTION
It is conceivable that if we could use information in court the Government might successfully prosecute Judith Coplon and a number of subjects in the Silvermaster and Perlo groups. It is also evident that a public disclosure of information would corroborate Elizabeth Bentley.
Judith Coplon was not mentioned by name in the messages but the identifying information set forth in the traffic, dated July 1944 and Jan. 1945, concerning the individual designated by the cover name "Sima" made it certain that "Sima" was Judith Coplon. Our subsequent investigation added additional evidence when it was determined that Coplon was still operating as a Soviet espionage agent in 1949 when she was observed in contact with her Soviet superior, Valentin Gubitchev.
The information tends to fall into certain divisions corresponding to a considerable extent to the divisions apparent in the Silvermaster-Perlo cases. From the data set forth in the messages and from our knowledge of the Silvermaster and Perlo groups, as furnished by Elizabeth Bentley, it appears that Silvermaster is identical with the individual in designated by the cover name "Robert." It also appears that "Donald" is William Ludwig Ulman; that Bentley herself is "Good Girl" and "Myrna"; whereas Helen Silvermaster appears to be "Dora"; Abraham George Silverman fits "Aileron" and Jake Golos appears identical with "Zouk." Others in the Silvermaster group have been tentatively identified with individuals designated by cover names in the material.
The Perlo group fits into the information when we examine the following message of 5/13/44:
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