My guest is John Boessenecker, former police officer and New York Times bestselling author of "Texas Ranger: The Epic Life of Frank Hamer, the Man Who Killed Bonnie and Clyde".

In this first part of the episode, he talks about Hamer's wild and bloody career in Texas law enforcement from 1906 until 1920, and makes the case that Hamer was the greatest American lawman of the twentieth century.

More about the author here: https://us.macmillan.com/author/johnboessenecker

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