TOP SECRET UMBRA
John SchindlerA Counterintelligence Perspective on Espionage, Terrorism, Deception and Propaganda
| Platform |  | Pricing | Freemium | Publishes | Daily |
|---|---|---|---|---|---|
| Issues | 560 | Subscribers | Read | topsecretumbra.substack.com |
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Latest Issues
Recent posts by this newsletter. Browse the email archive.
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Remembering Al Gray, SIGINT Warrior
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Authors
The writers behind this newsletter.
Counterintelligencer, cat herder, KuKservative, mystery-hunter, author about town. more
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