CIA vs KGB. The Art of Espionage

Allen Dulles, the director of the CIA in the 1950s and 60s, during the Cold War between the Soviet Union and the USA, knew like no one else the intricacies of the struggle between the KGB and the CIA and the methods used by the KGB on the political stage of the world, where two competing systems—communism and capitalism—faced off. In such circumstances, the intelligence organizations of both countries did everything to cause as much trouble for each other as possible.
It is therefore natural that the opinion of a direct participant in the "war of intelligence services" about the famous espionage operations will be of interest to everyone.