The Federal Bureau
of Investigation struggled in the 1920's to find sufficient evidence to convict the gangsters of the '20's. The FBI
had another problem other then the mobsters, the Ku Klux Klan. The FBI used the Mann Act to bring the KKK to justice.
On August 21, 1920 the Chicago division of the FBI was created
to help to contain the mobsters that were stationed in Chicago. Mobsters such as John Dillenger and Al Capone resided
On May 10, 1924 J. Edgar Hoover was appointed as the head of the
FBI. At this time the FBI consisted of 650 employees with 441 special agents. Hoover enstated the rule that new
agents had to between 25 and 35 years of age. He also created 30 field offices and had reagular inspections of all operations
at all the different cities. He had all the divisions of the FBI in the different cities start a fingerprint collection
of the criminals they brought in.
The Chicago division of the FBI had a large task to try and
eliminate all the gangsters that resided there in the 1920's. On Feb, 14, 1929 the ST. Valentine's Day Massacre occured
in Chicago and the Chicago FBI did a ballistics test which led to the creation of the FBI lab which has been used to further
assist the FBI agents in catching criminals. On March 27, 1929 the Special Agents in Florida arrested Al Capone for
failing to appear in court in Chicago.