I guess life is easier when you can arrest your competitors instead of just shooting them, but I don't have any idea how nobody narced on him to the feds (or at least their lawyer) for that long.
But then police were organized crime before police were police. To this day I don't know why the Pinkertons still exist as a corporate subdivision name instead of being fully absorbed to distance from that profound emotional baggage.
(Opinions colored by roommates' future BIL being murdered by cops in broad daylight in Chicago for DWB+autism, then moving to and dealing with Seattle PD's corruption/brutality problems)