From Richards Heuer’s: Nosenko: Five paths to judgement
“The election of President Reagan and the subsequent appointment of William Casey as DCI led to the sixth full-scale study of the Nosenko case- 17 years after his defection. Tennant Bagley, who had retired nine years earlier, sought to use the opportunity of a new administration with a harder line on the Soviet Union to reopen the case. In March 1981 he sent the new DCI a lengthy study entitled "Why Nosenko Is a Plant-and Why It Matters." He argued that acceptance of Nosenko indicated continued high-level penetration and manipulation of CIA by the KGB. Director Casey named Jack Fieldhouse to investigate Bagley'S allegations.
In August 1981, Fieldhouse produced a study entitled "An Examination of the Bagley Case Against Yuriy Nosenko." Whereas previous analysts had focused exclusively on Nosenko's statements and his handling, Fieldhouse recognized the importance of the historical context in which the case transpired. He noted at the outset, for example, that the foundation of the problem was laid before Nosenko ever arrived, as this was at a time when fear of the power of the KGB was perhaps at an all-time high. This historical context, and the reasons for the fear, are discussed in detail below. Fieldhouse's report refutes Bagley's arguments point by point; identifies what went wrong and how it was possible for so many capable CIA officers to be so wrong for so long; and describes the serious adverse impact the master plot theory had on the handling of many other Soviet cases.
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