I see in a documentary that in the 1980 a cop from las vegas went to Chicago to say that if Spilotro and his crew will kill a cop,he and other cops will come back to chicago and kill the Outfit bosses relatives.

So las vegas cops threaten to kill the bosses relatives, and all this because of the conduct of Spilotro. Now already it's serious that a cop threatens a made man, let alone a boss.

So why the outfit he waited another six years to kill Spilotro? while if it killed before they could salvage something in las vegas.