Dave Troy has been digging into the connections leading up to the January 6th insurrection at the US Capitol. He has just published a considerable thread detailing those connections going back decades. He starts out with:
In 1975-1976, the Church Committee investigated allegations that CIA, NSA, FBI, IRS, and Army intelligence had spied on Americans and otherwise abused power; the committee’s work led to changes that greatly limited the power of these agencies.
It’s a lot to take in all at once. However, I know that Dave and others have done their homework on this. The full dump, including references, is also available in a single document.