A disturbingly large number of criminal organizations form on racial lines and hold explicit racial supremacist views. There's white supremacists, black supremacists[0], MS-13, and so on. Religious divisions are also fertile soil for crime; that's how you get all the Islamofascist terrorists[1] like Al-Qaeda, ISIS, Boko Haram, and so on. We don't usually think of any of these groups actually becoming the government, but it's entirely possible for this to happen (e.g. with the Taliban).
Going the other way you have police organizations like NYPD, LAPD, or LASD that are exercising sovereign power without oversight. They aren't explicitly racist, but are easily infiltrated by white supremacists who are part of gangs. In the case of the LASD, they have so many gangs in them there's a dedicated Wikipedia page for it[2].
It's easy to miss out on this because, for the most part, gangs are the Scary Other that your local white supremacist is using to make racial minorities look more threatening. That's because fascists have two kinds of enemies: their stated enemies - i.e. other races; and their de facto enemies - i.e. liberals who don't want a perpetual race war. Fascists will shout and scream about MS-13 or Islamists by day, while breaking bread with them by night. Because they are ultimately plotting the same thing: how to steal your money, your livelihood, your freedom, and your life.
[0] I have a friend who calls Louis Farrakhan "Blitler".
[1] Christofascist terrorism is not a matter of if, but when.