David Martin was amazing. Two other books by him, “Patriot or Traitor” and “Web of Disinformation” are must-reads on this subject matter.
To date, there is no monument to Mihailovich in Washington, D.C. I am unfamiliar with this monument that you mention, “Victims of Communism” - I would like to learn more about it.
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I loved "The Web of Disinformation". It was really helpful also in understanding the post-WWII British mindset that suppressed the Mihailovic story, was the same one that George Orwell faced in getting Animal farm published -- a collective self-censorship that existed, so as not to offend the Left. In his original introduction to the book (that he was forced to rewrite) Orwell actually even mentioned the Mihailovic case.
Also, the outing as Soviet spies of the so-called Cambridge Set of Philby, Burgess and McLean & others should have come as no surprise, given that James Klugman who recruited them for the Communist Party while they were students at Cambridge, also had run the Yugoslav desk during WWII -- altering the reports to favor Tito and condemn Mihailovic which ultimately led to Churchill abandoning Mihailovic in favor of Tito.