PHILADELPHIA, Dec. 8 -- Several hundred supporters of death row inmate Mumia Abu-Jamal rallied today for his release, marking the 20th anniversary of the shooting of a police officer.

An exhibit titled “ Mumia Abu-Jamal: A Portrait of Mass Incarceration,” will be displayed across campus in the John Hay Library, the John D. Rockefeller Jr. Library, the Center for the Study of Race ...