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 ''III. ''

''The messages furnishes the Bureau are, for the most part, very fragmentary and full of gaps. Some parts of the messages can never be recovered again because during the actual intercept the complete message was not obtained. Other portions can be recovered only through the skill of the cryptographers and with the Bureau's assistance. Frequently, through an examination of the messages and from a review of Bureau files, the Bureau can offer suspects for individuals involved. When breaks out a part of the message and reads to the point where it is determined that reference is being made to certain information derived from U.S. Government records or documents, the Bureau conducts investigation to locate such records or documents. When located, these records are furnished to and if it turns out to be the correct document,  uses it as a "crib" and thus is able to read previously unrecovered portions of the message. It must be realized that the cryptographers make certain assumptions as to meanings when deciphering these messages and thereafter the proper translation of Russian idioms can become a problem. It is for such reasons that has indicated that almost anything included in a translation of one of these deciphered messages may in the future be radically revised.''

''Another very important factor to be considered when discussing the accuracy of these deciphered messages is the extensive use of cover names noted in this traffic. Once an individual was considered for recruitment as an agent by the Soviets, sufficient background data on him was sent to headquarters in Moscow. Thereafter, he was given a cover name and his true name was not mentioned again. This makes positive identifications most difficult since we seldom receive the initial message which states that agent "so and so" (true name) will henceforth be known as "_______" (cover name). Also, cover names were changed rather frequently and teh cover name "Henry" might apply to two different individuals, depending upon the date it was used. Cover names were used for places and organizations as well as for person, as witnessed by the fact that New York City was "Tyre" and the FBI was "Hata." All of the above factors make difficult a correct reading of the messages and point up the tentative nature of many identifications.''