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The most notorious head of the FBI was a true pioneer in law enforcement, and he saw the value of fingerprints, blood testing, and handwriting analysis, as essential tools in the fight against crime, and this is shown very well in Eastwood’s work. The movie also shows Hoover’s role in the battle against infamous criminals from the Depression such as Baby Face Nelson and John Dillinger, which was the case.
In reality, the FBI played only a limited role in the case, and Hoover’s new forensic techniques did not lead to the capture of the criminal who kidnapped the Lindberg baby.<ref>Gentry, P 319</ref> In one scene the central character is challenged by a Senator who claimed that he should not be the country’s top cop because he had never arrested anyone. An enraged Hoover is shown as flying into a rage and arresting some gangsters in response to the Senator’s jibes. The head of the Bureau could not arrest anyone because of a Congressional rule, and he was not that bothered by the Senator’s claims.
====The FBI and wire-tapping====