I frankly don't know what everyone else in this thread is talking about. US successes during the cold war were numerous, and anyone claiming that are not discussed in the literature frankly does not know what they are talking about. It's late here, but off the top of my head you might consider:
Of these, the most crucially important were probably Kuklinski, Penkovsky, and Especially Tolkachev (he is known as the Billion Dollar Spy for a reason)
Again this is just off the top of my head, so it is broadly skewed toward both human intelligence collection and the Warsaw Pact. Signals intelligence was, if anything, even more crucial, and the NSA unquestionably was the world leader in decryption for the entirety of the cold war.
Similarly, if one were to treat covert action as well as espionage, the list would get quite a bit longer, including operations in Poland, Italy, Afghanistan and Iran, to say nothing of numerous successful political action campaigns aimed at shoring up liberal democratic parties, and the non-communist left in general. The idea that the KGB was perpetually eating America's lunch is nonsense.
There is a book called the billion dollar spy. https://www.amazon.com/Billion-Dollar-Spy-Espionage-Betrayal-ebook/dp/B00OEXDLPU