How mass incarceration became the new jim crow - control of people of color?

Police officers and judges are more biased towards african americans and other minorities. They already have misconceptions that minorities are criminals so they lock them up with harsher sentences than their white counterparts. The prison system also isn't built around rehabilitation like it should be and since minorities are incarcerated more than white people and for longer periods of time, it keeps them in the system and a stain on society.