Mandatory minimum sentences give no discretion to judges about the amount of time that the person should receive once a guilty verdict is rendered. Harsh mandatory minimum sentences for drug offenses were passed by Congress in the 1980s as part of the war on drugs and the "get tough" movement, sentences that have helped to fuel our nation's prison boom and have also greatly aggravated racial disparities, particularly in the application of mandatory minimum sentences for crack cocaine.

In the 1990s - the period of the greatest escalation of the drug war - nearly 80 percent of the increase in drug arrests was for marijuana possession, a drug less harmful than alcohol or tobacco and at least, if not more, prevalent in middle class white neighborhoods and college campuses as it is in the 'hood.

My fear is that we will mistake the brand, the "resistance," for greater unity than actually exists and wind up settling for any Democrat the next time around. We have an opportunity right now to build much greater consensus about the need for a meaningful alternative and building a truly transformational movement, town by town, city by city, that has the potential to help birth truly revolutionary change in this country. That potential exists. We got a glimpse of it when such enthusiasm erupted over a democratic socialist Bernie Sanders running for president.

If we continue to tell ourselves the popular myths about racial progress or, worse yet, if we say to ourselves that the problem of mass incarceration is just too big, too daunting for us to do anything about and that we should instead direct our energies to battles that might be more easily won, history will judge us harshly. A human rights nightmare is occurring on our watch.

I think it's important to encourage young people to tell their own stories and to speak openly about their own experiences with the criminal justice system and the experiences of their family. We need to ensure that the classroom environment is a supportive one so that the shame and stigma can be dispelled.

The fact that more than half of the young black men in any large American city are currently under the control of the criminal justice system (or saddled with criminal records) is not - as many argue - just a symptom of poverty or poor choices, but rather evidence of a new racial caste system at work.

Mass incarceration has become normalized in the United States. Poor folks of color are shuttled from decrepit, underfunded schools to brand new, high tech prisons and then relegated to a permanent undercaste - stigmatized as undeserving of any moral care or concern.