This book is the entire complete work of John L. Spivak. The New Technique of Nazi Warfare. Exposing Hitler's Undeclared War on Americans. The material in this small volume just barely scratches the surface of a problem which is becoming increasingly grave: the activities of Nazi agents in the United States, Mexico, and Central America. During the past five years I have observed some of them, watching the original, crudely organized and directed propaganda machine develop, grow and leave an influence far wider than most people seem to realize. What at first appeared to be merely a distasteful attempt by Nazi Government officials at direct interference in the affairs of the American people and their Government, has now assumed the more sinister aspect of also seeking American naval and military secrets. Further studies in Central America, Mexico and the Panama Canal Zone disclosed an espionage network directed by the Rome-Berlin-Tokyo axis and operating against the peace and security of the United States. A scrutiny of the Nazi Fifth Column in a few European countries, especially in Czechoslovakia just before that Republic was turned over to Germany's mercy by the Munich "peace" and in France where Nazi and Italian agents built an amazing secret underground army, has made the fascist activities in the Western Hemisphere somewhat clearer to me.