“As soon as our documentation shop was well under way, I concentrated on weapons for spies and saboteurs. You will realize that a spy (or more delicately put, an intelligence agent) must actually never have a weapon at all. His job is to collect and transmit information. he does require invisible inks, minute cameras camouflaged as match boxes, or other small objects logical for him to possess and, if possible, a clandestine radio transmitter and receiver.”

– from Amazon:
Of Spies and Stratagems: Incredible Secrets of W.W. II Revealed by a Master Spy (by Stanley P. Lovell)

In 1940 OSS chief Donovan wrote an article about the German-American Bund, Click here to read it.