Hoover used his experience working as a library clerk at the National Archives to set up the system using extensive cross-referencingThe division took files from the Bureau and'systematized' them via index cards; according to Walker and contrary to evidence, the cards covered 200,000 people.
Hoover used his experience working as a library clerk at the National Archives to set up the system using extensive cross-referencing. The General Intelligence Division took files from the Bureau of Investigations (later renamed the Federal Bureau of Investigation) and'systematized' them via index cards; according to Walker and contrary to evidence, the cards covered 200,000 people.