This book, for the first time, impartially and objectively presents extensive factual material about the betrayal of Soviet (Russian) intelligence officers, from the revolutionary years to the 90s. There is an opinion that in the entire history of Soviet intelligence, the number of defectors and traitors was about twenty people. But, unfortunately, this is far from the case. And proof of this is the book, in the process of working on which the authors managed to collect bit by bit information about the facts of treason by Soviet intelligence officers.