Harry has a past. We are reminded by the man who kept trying to him. He also is supposed to have an American accent. Looks likely to be an undercover or former CIA agent. Janet his boss or prior one. Sides taking play. Will end badly for all at play and Harry will end up being the key player to eliminate them all on behalf of the CIA. Harry is clearly experienced and trained further than just being a methodical or instinctive mob member. Seems to be the logical end game.