I mean, there is probably lot of actual good you can do from within, while pushing back against the bad the agency is doing. No matter how you approach it, take their $$.
You would have to do more harm than good to their work, but especially if you got some friends to apply with you, pretended to be huge bigots during the application process, and proceeded to just commit acts of sabotage and do a terrible job once hired, you could possibly save a lot of lives.
Even operating alone you could possibly find ways to warn communities before arrival, and smaller forms of sabotage, as well as informing the public what goes on.
Getting hired and doing a sloppy job is not enough. You need to obstruct somehow. Which also of course comes with risk - in times like these doing the right thing always does.