Its a perfect setup.
1) Pick a minority with an easily identifiable physical trait (so your beat cops don't have to be too bright)
2) Encourage a set of behaviors through entertainment culture that are unique to them, easily identifiable, and just distasteful enough to garner popular support against them without destabilizing society.
3) Arrest them en-mass and incarcerate them in private prisons.
4) Hella-profit. Channel a portion back to #2. Repeat.