This episode discusses the original "gangster" of the term "Going Postal", Patrick Sherrill.  1986, the local Post Office in Edmond, Oklahoma brought attention to violence in the workplace when Sherrill came to work that day and unleashed hell.

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Going Postal by Tom Spallone available in paper, ebook and audiobook at:

https://www.amazon.com/dp/B0933KWBT2/ref=cm_sw_em_r_mt_dp_ZWDHQE5ZB3F8BYNX77EX