The outrage that erupted and spilled into the streets of Baltimore in the days after 25-year-old African-American Freddie Gray died in police custody harkened back to another painful and ugly moment in American history. Heavily armed police on the streets, clouds of tea gas, protesters being dragged away against their will: it could have been Baltimore 48 years ago—1968—after the assassination of civil rights icon Dr. Martin Luther King, Jr.

But it was April 2015. The city burned with anger, outrage and grief for days. Several months later, six Maryland police officers—not all were white—were charged in connection with Gray’s death. The state prosecutor cited the cops for improperly arresting and shackling Freddie Gray in violation of police rules by loading him into a van without the required safety restraints, and also ignoring his pleas for help.

Freddie Gray, the riots and the sudden shattering of business as usual in Baltimore morphed into a symbol of all the other recent violence between police and the black community, some recorded on smart phones and uploaded to social media websites. A year later, things are quiet, at least on the surface. But much remains unresolved, prime to erupt again as law enforcement grapples with a crisis that until recently had been swept under the carpet.