"I know the capacity that is there to make tyranny total in America. We must see to it that this agency and all agencies that possess this technology operate within the law and under proper supervision, so that we never cross over that abyss. That is the abyss from which there is no return." -- U.S. Senator Frank Church on the NSA, 1975

and after his investigations into the cia and friends, though only done on a surface level after being warned, he was told it would be the end of his career, and they were right.