In 1924, J.E. Hoover was appointed by the US Congress as the first chief of the Bureau of Investigation of the US, the predecessor of the FBI that was oficially founded in 1935. He continued as director during 37 years until his death.
He is a controversial figure. On one hand, he managed to construct and administer a huge crime-figthing agency with modernized police mechanisms. On the other hand, some evidence has been collected over the years that proves that at some points he exceeded the functions he was supposed to perform, exercising an unlimited control from his intimidating position, that reached even the figure of the President.