Unverified50% confidenceFactExact time
The SR-100 receiver exploited the weakness that KGB surveillance teams used specific frequency bands for voice communications, determining whether she was being followed by listening to the communications.
1
Sources
50%
Confidence
Long-term
Relevance
10/15/2026
First Seen
Sources
The CIA's First Female Agent in Moscow: Inside the Cold War's Riskiest Operation
youtubeNational Geographic10/15/2026
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