This took place in 1920? J.Edgar Hoover didn’t runt the FBI until 1924. It may be clumsy writing but he never ran for president either.
Hoover was in charge of the General Intelligence Division of the Justice Department’s Bureau of Investigation in 1920, the forerunner of the FBI. As such, he was involved in the investigation of the as yet unsolved Wall Street bombing of 1920, which killed 40.