Sorry, but the FBI, ATF, DEA, Ed Dept, Energy Dept, and a host of other federal bureaucracies need to be abolished; not reformed.
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Indeed, the reform is to shutter the FBI. A national police force is a bad idea. it was corrupt from the get go with Hoover staying in power thru blackmailing government officials. The FBI has now grown in its abusive use of power to now deciding who should or should not be president.
The rationale for the FBI was the automobile.
Cars made it possible for bank robbers to cover long distances quickly, crossing state lines before local cops could catch them. Whereupon jurisdiction and extradition became problematic issues.
The response was Hoover's G-Men, who could cross state lines with impunity.