Technically, you just explained how he found it out and got away from it.

"Kasperov was a part of a joint investigation between the DSP and the IFO-B that led him to a conspiracy that involved the DPS and the High Council."

If only one person found out, the person would be killed.

If two braches found out, it would be a clusterfuck.

It WAS a clusterfuck.

With the way New Order is... they wouldn't like clusterfucks and would most likely call DSP a rouge agency and kill anyone involved with Operation Gunrunner and Project Undershaft. This would also mean some good portion of the high ups.

Everyone being in the same boat, it would make sense that they would decide to bury it with threats, bribes and promotions.