This book explores the intriguing success of left-wing amateur intelligence workers who were recruited to the Soviet intelligence services from the United States, Britain, Europe, Australia and Canada from the 1930's to the 1950's.

1 The Roots of Conspiracy 2 The Communist International and Clandestine Methods: the Conspiratorial Impulse 3 Comintern's Underground in Western Military Forces 4 Underground in Asia 5 The 1930s: from the Underground to Espionage 6 A Trojan Horse within Social Democracy 7 Fighting Fascism through Espionage