Frank Church was an intel officer in WWII. He was a national hero in reigning in the utter lawlessness of the FBI and CIA. They overcame it, but he tried to return them to being under control.
I agree with you on Church—the Church Committee did an amazing job—the Deep State had gotten way out of control.
The bad news is that they just took the “dirty laundry” and started hiding it deep in underground military bases where Congress could not find it.