. . "spy for the Soviet Union" . "Soviet espionage" . "Soviet espionage in the United States" . . "intelligence activities in the United States" . . "Soviet spy networks" . "Soviet espionage in America" . "Soviet espionage in the United States#Soble spy ring" . . "Soviet espionage in the United States" . . "Soble spy ring" . "United States" . "Russian spy" . "Soviet spy rings" . "Soviet intelligence in America" . "Soviet espionage operation in the United States" . . "Communist underground" . "Soviet_espionage_in_the_United_States" . "History of Soviet espionage in the United States" . "Soviet underground" .