It has been nearly two years since the killing of Michael Brown Jr. by a police officer in Ferguson, Missouri, touched off outrage and a national movement to save black lives from state violence. Now, just days ahead of the anniversary of Brown’s death, a coalition of organizations that grew from that uprising have launched a policy agenda calling for deep criminal justice and policing reforms. The Movement for Black Lives — under the catch-all banner of the Black Lives Matter movement — has put together what it describes as a “clear vision of the world where black humanity and...