Francis "Two Gun" Crowley
This story was researched through official police records as well as the extensive newspaper articles that appeared in the New York City newspapers of January through May 1931 including the New York Daily News, The New York Times and the New York Post. Also the following sources were used:
Brillis, Nick, Police Officer, Yonkers Police Department who provided research and official police records on the murder of Virginia Brannen from the Yonkers Police Historical Society.
Drimmer, Frederick (1990) Until You Are Dead. New York, NY: Windsor Publishing Co.
Elliot, Robert G. (1940) Agent of Death: The Memoirs of an Executioner
Lawes, Lewis E. (1932) Twenty Thousand Years in Sing Sing. New York, NY: Ray Long and Richard Smith, Inc.
Nassau County Police Department who provided records, reports and photos on the murder of Officer Fred Hirsch Jr.
Squires, Amos O., Dr. (1935) Sing Sing Doctor. Garden City, NY: Doubleday, Doran and Company Inc.