How This Year's Antiracism Protests Differ From Past Social Justice Movements: A Trusted Video Source

Philadelphia protests over the killing of Walter Wallace Jr. represent only the latest in a year of nationwide demonstrations against racism and police violence. The ongoing movement has captured attention and provided political fodder -- but it also reflects a long American history of organizing against injustice. Amna Nawaz talks to author Peniel Joseph of the University of Texas at Austin.