Title: Secret Agents Against America
Author: Richard Wilmer Rowan
Rowan, Richard Wilmer (1949). Secret Agents Against America: Reveals the Sensational Inside Story of Foreign Espionage & Sabotage America. New York: Doubleday, Doran
Date Updated: November 4, 2016
Richard Rowan is arguably he outstanding American authority on international secret service. In this book he looks behind headlines to present the sensational inside story of foreign espionage and sabotage in America. In the inter-war period.
Reviewed by Paul W. Blackstock and Frank L. Schaf
In this book the astute chronicler of intelligence history sounds the warning of clandestine infiltration of the United States by foreign powers and the woeful state of U.S. counterintelligence to meet this threat. He elaborates on the organizations of the Germans, Japanese, and Italians that were intruding in the United States and its Latin American neighbors to conduct espionage and sabotage. An excellent review of intelligence against the United States in the immediate pre-World War II period.
 Blackstock, Paul W. (1978) and Frank L. Schaf, Jr. Intelligence, Espionage, Counterespionage, And Covert Operations: A Guide to Information Sources. Detroit: Gale Research Co., p. 166