I've read various stuff to this extent, but the most interesting treatment was in the documentary called "Crips and Bloods: Made in America" that examines the o

I've read various stuff to this extent, but the most interesting treatment was in the documentary called "Crips and Bloods: Made in America" that examines the origins of those two gangs. A big part of it was how the LAPD would only enforce laws in certain neighborhoods. The gangs were literally trained by the police that if they commit crimes on one side of a particular street, the laws will be enforced, but if they commit crimes on the ghetto side of the street, they will not be.