Yeah but by mostly (not always in the US) sticking to their own, the Italian Mafia is one of the oldest organized crime groups in the world, by still being present for almost two centuries
Actually by sticking to their own, that has helped contribute to their demise. Once there was 25 families in the US but now there are only 9. Less full blooded Italians around and the ones that are around don't want to join the mob.
