The point is they did know about it.
Not doing anything about it means they let him go off when he had the opportunity.
It’s called being Serpico’d. You just stand back and let the ghouls do what they do. Then pretend you didn’t see it coming.
NFL O lineman’d
That would imply that the Feebs/SS, and local law enforcement were working together to let Crooks (or whomever) get in place, and get off the shots.