Heck, J. Edgar Hoover was still head of the FBI when I decided they were untrustworthy! For goodness sake, he was head of the FBI from 1924 - 1972, dying while still leading the FBI!
“Later in life and after his death, Hoover became a controversial figure as evidence of his secretive abuses of power began to surface. He was found to have exceeded the jurisdiction of the FBI, and to have used the FBI to harass political dissenters and activists, to amass secret files on political leaders, and to collect evidence using illegal methods. Hoover consequently amassed a great deal of power and was in a position to intimidate and threaten sitting presidents.” - Wiki
You are right but I was not paying much attention to tyranny until later on.