I'm operating under the assumption that Barr and Wray are actually on our side.

The thing is, the DOJ may be incapable of acting as the corruption is a National Security matter. In other words, if it comes out. It may be too sensitive and would tip off foreign adversaries that we are onto them.

See also: 2018 Executive order - Gives the DOJ 45 days after the rigged election to produce a national security report and broadens the power of their department to take action.

If it is just a local homegrown FBI matter, I think the DOJ and FBI would likely act.

Not saying that there is no corruption among their ranks, but I am saying that if it is National Security related. They may not be able to play their cards over risk of exposing certain agents who are investigating the foreign interference/corruption.