"German Espionage and Sabotage" Topic

"How extensive and effective were German espionage and sabotage activities against the United States in World War II? To make generalizations is always dangerous, but certain broad conclusions may perhaps be stated at this time, subject to minor corrections in the light of future data that may be uncovered from enemy sources or that is still closely held by United States or Allied agencies for security reasons. On the side of the enemy's activity it is well-established that from a period before Pearl Harbor until the very end of the war Germany engaged in intensive efforts to obtain military, economic, and political information from the United States. In furtherance of this effort she recruited numerous secret agents to operate within the United States and established extensive espionage networks in other countries of the Western Hemisphere. In the field of attempted sabotage the activity was not comparable; the failure of the large-scale mission entrusted to the eight saboteurs who landed on the East coast in June 1942 appears to have discouraged further efforts in this direction. The German record of accomplishment did not measure up to the effort expended. As far as is known there was no enemy inspired act of sabotage within the United States during the war. On the espionage side, while Germany did from time to time obtain information relating to war production, shipping, and technical advances, it was almost always too late, too inaccurate, or too generalized to be of direct military value. It is possible that in early 1942 Germany did obtain some information that assisted in locating submarine targets, although this has not as yet been finally determined; but on the whole, after Pearl Harbor, German espionage against the United States failed to produce the information required by the High Command. This failure was due to a combination of Allied counter-measures and fatal weaknesses on the part of German intelligence itself…"
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Amicalement
Armand

I'd recommend this book, "The Air Raid Warden was a Spy." by William Breuer. A number of stories of spying on the American homefront during WW2. link

Thanks!.

Amicalement
Armand