Sergey Vorontsov



CIA code: Cowl

Vorontsov disclosed KGB operations against the U.S. Embassy in Moscow. 

He provided the CIA with "spy dust," material the KGB sprayed on U.S. cars in Moscow to see who might be spying for the CIA. 

Vorontsov was one of the 25 agents betrayed by Ames. He was executed. 




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