The mafia seems to be the big city equivalent of the KKK. While the KKK did bad things, they didn’t put up with this type of behavior, either.
Tribalism of a different sort. The government does bad things too. Try reading articles and simply replace ‘FBI’, or ‘Police’, with ‘thug’. It doesn’t work all the time, but increasingly it does.
My stepdad (he is 91 years old) told me about the Klan; according to him they didn’t bother the blacks where he lived; the ones they went after were those in the white community that were known to be abusive or didn’t take care of their families or were just bad apples in general.
Such people got run out — at gunpoint.