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The recent film Oppenheimer brought a renewed interest in the history of atomic espionage. The names certainly echo throughout history: Julius and Ethel Rosenberg, David Greenglass, Morton Sobell, William Perl, Harry Gold, and more. Then there are other notables, more obscure but whose activities were considerably more damaging than the above-named. One was known in the Venona decrypts — a batch of intercepted Soviet cable traffic in the 1940s — by the codenames FOGEL and PERS. It still remains a mystery who “Perseus” really was, but this might have been Oppie himself, among other possibilities.