William J. Flynn, nicknamed "The Bulldog Detective", had a fascinating and accomplished career in law enforcement. While in the Secret Service he not only battled the Mafia in New York City, but also uncovered a sophisticated German spy ring on the cusp of America's entry into World War I.  As Director of the Bureau of Investigation, he devised the first counterterrorist strategy in United States history. He was a writer as well, contributing articles both to journals and to a true crime detective magazine which bore his name.  My guest is author and terrorism expert Jeffrey D. Simon, and his recently published book is called "The Bulldog Detective: William J. Flynn and America's First War against the Mafia, Spies, and Terrorists." He shares highlights from Flynn's riveting life and career.  Jeffrey Simon's website:  https://www.futureterrorism.com/ This episode is sponsored by Factor. Go to https://factormeals.com/notorious50 to get 50% off! Use code notorious50. Learn more about your ad choices. Visit megaphone.fm/adchoices