How to explain the KGB’s amazing success identifying CIA agents in the field?

As the Cold War drew to a close with the fall of the Berlin Wall in November 1989, those at CIA headquarters in Langley, Virginia, finally hoped to resolve many long-standing puzzles. The most important of which was how officers in the field under diplomatic and deep cover stationed across the globe were readily identified by the KGB. As a consequence, covert operations had to be aborted as local agents were pinpointed...
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