What connection does the author draw between people's experience with the criminal justice system and their race and class identities?

The author describes a very distinct experience between the criminal justice with race and class identities. In certain states, there are pre built notions and characteristics about people of different races and colors. The criminal justice system is equally biased against a different race.

So when a case comes in, and different race is involved, the justice system automatically puts the decision in favor of their own regardless of who the real criminal is. This injustice is very common for immigrants.