The FBI
On July 26, 1908, Attorney General Charles J. Bonaparte appointed an unnamed force of special agents to be the investigative force of the Department of Justice. The FBI evolved from this small group.
An unnamed force of....?? That doesn't sound sketchy at all. .
Who does the FBI answer to:
https://www.fbi.gov/about/faqs/who-monitors-or-oversees-the-fbi
Who monitors or oversees the FBI?
The FBI’s activities are closely and regularly scrutinized by a variety of entities. Congress—through several oversight committees in the Senate and House—reviews the FBI’s budget appropriations, programs, and selected investigations. The results of FBI investigations are often reviewed by the judicial system during court proceedings. Within the U.S. Department of Justice, the FBI is responsible to the attorney general, and it reports its findings to U.S. Attorneys across the country. The FBI’s intelligence activities are overseen by the Director of National Intelligence.
So this Attorney General essentially acts autonomously? The president appoints them, congress pays the bills, but they're just trusted to act without real oversight?
Have you heard of the praetorian guard? They were the personal guards of Roman Emperors.
In practice they were known to assassinate Emperors, and at their worst they actually sold off the position to a highest bidder.