Goodreads Doesn't Have It, Data Migration: The Main Enemy
Very good book to learn about the KGB and what they do.
This is where they talk about how they literally doctored a person's passport photo with the FSB so that some vain stupid people at the border wouldn't let them in. And it worked. That is the most incel thing I've seen in my life.
But it's in a publicly available book. You just have to read.