A loose definition of Organized Crime is several individuals acting in concert to conduct an ongoing criminal enterprise,so it could be interpreted as such.
Under the common usage,we tend to think of organized crime in terms of the Italian Mafia / Cosa Nostra.
Given that interpretation,I wouldn't call it an OC film.
However,I absolutely agree that it one of the best Heist/Caper movies ever. It is in the vein of the Ocean's series,Layer Cake,and Ronin.to name a few,but it rises so far above all of them.
Until something else comes along,(if that's even possible),I concur with your spot-on characterization of this being the definitive winner.
