I have just finished your biography of Leon Trotsky. While I have some disagreements with some smaller points raised in the book my primary concern is your treatment of Joseph Hansen on page 138.
Your somewhat gushing praise of him concludes one to believe that you are in general sympathy with his politics and his role in the Trotskyist movement.
I am surprised to see that you fail to inform your readers who would be probably reading about Leon Trotsky for the first time that Hanson was, in fact, a United States government agent working inside the Trotskyist movement.
If you do not agree with this, then that is your right, but you should have least inform your audience of the massive evidence that has been produced that points to Hansen’s’ role in Trotsky’s’ murder.
In the document attached, I would like to draw your attention to the investigation into Security and the Fourth International.
World Socialist Web Site online interview commemorates 75 years since the assassination of Leon Trotsky 5 October 2015 http://www.wsws.org/trotsky/interview/part1.html
 Trotsky (Life & Times) Paperback – 31 Aug 2004 Dave Renton