Ruth Beverly Wilson was married to Jacob Epstein. Epstein had been wounded in the Spanish Civil War after he volunteered for the International Brigades. Ruth, who was a nurse, met him while he was recuperating from his injuries. They were allegedly Soviet intelligence agents, who were stationed in Mexico City during World War II. They were allegedly involved in the efforts to break Leon Trotsky's killer, Ramón Mercader, out of a Mexican prison. Wilson's code name in Soviet intelligence and deciphered in the Venona transcripts is Nona .
Ruth Wilson is referenced in the following Venona decrypt; the decryption cites that the KGB suspected courier A had come under surveillance. Courier A is believed by researchers to be Anna Colloms.