You mean like Trump is doing? That's what he's doing, destroying the systems of federal law enforcement and the government being in charge of everything. And, just like in more or less every country where there's no particular "democratic" machine to keep everything in check, the rich people can now take over unfettered by anything even nominally limiting them.

I think a lot of people tend to think in terms of "FBI is evil, destroy the FBI," for pretty understandable reasons, without thinking through the "Okay what replaces the FBI? What happens next?" part of the planning. And likewise for political parties, for media empires, and so on.

Personally I think that a lot of the answer is in giving political power back to the unions. Stop the entire abstraction of having a class of "politicians" who have a big professional organization devoted to maintaining their power, and instead, have powerful unions organized by the people who are part of them, who keep themselves sharp by fighting with the capitalist class for a fair share, and then have those be the people who are determining who gets to be on the ballot, who is taking part in the debate, and et cetera. But keep the democratic systems intact obviously. I have no idea how it would work out in practice, but it seems pretty realistic in the long run to be able to do, and I think if we did that, the fact that there was an FBI and a federal court system would all of a sudden not lead to all this "cross the boss and God help you" type of behavior by it.