1. Images of Crime and Justice in Early Commercial Radio—1932 to 1958
2. Calling All Cars
3. Athan G. Theoharis and John Stuart Cox, The Boss: J. Edgar Hoover and the Great American Inquisition (Philadelphia: Temple University Press, 1988), 157. For a review of the cultural growth of the FBI during Hoover's tenure, see Powers, G-Men.
4. Richard Gid Powers, Broken: The Troubled Past and Uncertain Future of the FBI (New York: The Free Press, 2004), 62.