Author and filmmaker Tim Tate discusses his book HITLER’S SECRET ARMY: A Hidden History of Spies, Saboteurs, and Traitors in World War II. (2019)

https://www.amazon.com/Hitlers-Secret-Army-Saboteurs-Traitors/dp/1643130773/ref=sr_1_4?keywords=hitlers+secret+army&qid=1572030603&sr=8-4 

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