The U.S. Customs Service was in charge of guarding the nation's borders to keep smugglers from bringing liquor (and
Policing was revolutionized with the widespread use of police cars and two-way radios.
later drugs) into the country illegally. Even the Internal Revenue Service (IRS) went after criminals—by charging them with tax evasion (not paying taxes). After other law enforcement agencies tried and failed numerous times to convict notorious gangster Al Capone (1899–1947) of various crimes, the IRS nailed him for tax evasion and sent him to prison.
Still, crime was out of control. In 1929 President Herbert C. Hoover (1874–1964; served 1929–33) appointed U.S. attorney general George Wickersham (1858–1936) to head a national commission to study crime and punishment in the nation. The commission produced fourteen volumes by 1931. The volumes addressed various issues related to policing, including police corruption and the use of too much force, which lead to violence against suspects. Much of the policing sections was written by Los Angeles police chief August Vollmer (1876–1955).
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