This document discusses the history of crime and law enforcement in the United States during the 1930s. It notes that crime and punishment were traditionally handled at the local and state level, but the federal government began playing a larger role under President Hoover. Several notorious gangsters and criminals from the 1930s are mentioned, including Bonnie and Clyde, John Dillinger, Baby Face Nelson, and Al Capone. Al Capone established a criminal gang in Chicago during the 1920s and ended up in prison in 1931 for tax evasion.