What makes the ideal gangster hunter? In the 1930s, outlaws like John Dillinger, Baby Face Nelson and Bonnie & Clyde were the scourge on the justice system of the United States.

To bring them in, the lawmakers needed to try something new. And that something new was the FBI.

Don is joined by John Oller for this episode to find out how the FBI's powers were expanded over the years, the problems that they faced, and the influence of J. Edgar Hoover on the process.

John is a journalist and author, his book on this subject is 'Gangster Hunters: How Hoover's G-Men Vanquished America's Deadliest Public Enemies'.

Produced by Sophie Gee. Edited by Matthew Peaty. Senior Producer was Charlotte Long.

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All music from Epidemic Sounds/All3 Media

American History Hit is a History Hit podcast.