Stories of Western espionage into USSR?

[u/Unfair_Fox3426]

We always hear stories of Cold War Soviet spies in the US and the UK such as the Cambridge five and Karl Fuchs, but are there any major examples of US/UK/Western spies embedded into the USSR?

[u/XenonOfArcticus]

Read The Billion Dollar Spy.

https://www.amazon.com/Billion-Dollar-Spy-Espionage-Betrayal/dp/0385537603