In major cities across the nation this weekend, people gathered to protest the police killings of black Americans. Peniel Joseph is founding director of the Center for the Study of Race and Democracy at the University of Texas at Austin. He joins host Krys Boyd to talk about how these protests resemble demonstrations of the Civil Rights era – and how social media and video footage have changed how people protest. Joseph’s recent book is called“The Sword and the Shield: The Revolutionary Lives of Malcolm X and Martin Luther King Jr.”