The Church Committee exposed many CIA abuses in 1975.
https://en.wikipedia.org/wiki/Church_Committee
That include Operation Mockingbird (mass media infiltration and control), mind control experiments etc.
It took a while but eventually that led to mass firings in the CIA.
Yes, thanks all. I did find this as well:
https://www.muckrock.com/news/archives/2018/nov/01/cia-massacre/
This article mentions that this mass layoff “was hardly unique in terms of CIA’s history”.
I guess the CIA never changes...