In the first few months of 1931, Francis "Two Gun" Crowley, an illiterate, psychopathic nineteen-year-old kid, went on a violent New York crime spree, which included murdering a Nassau county cop named Fred Hirsch. Things culminated in an intense gun-battle against between Crowley and over two hundred police officers, who had surrounded his Manhattan apartment building. 
My guest is Jerry Aylward, a retired New York detective of thirty two years, who has written the definitive book on the subject, entitled "Francis 'Two Gun' Crowley's Killings in New York City & Long Island".  More information can be found about him and his book at his website: jerryaylward.com. 
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