furnished by the Technical Laboratory, and the intensive investigation by SIS representatives, the persons referred to in the messages were identified, their cover names ascertained, and their associates were established.” This is highly misleading. The decrypts were indeed “furnished” to agents in the field by the FBI Technical Laboratory, after the coast guard had furnished the solutions to the Technical Laboratory. The evidence is on the original documents themselves. Before the coast guard sent the FBI a decrypt, the coast guard clerks typed “SIS Dupe” at the bottom of the sheet, beneath
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