2019 was marked by mass demonstrations around the globe. That ended with the pandemic. until millions witnessed George Floyd’s death. For more than two weeks crowds have risked their health to protest police brutality in all 50 states. People argue whether violent or non-violent protest works best. ERICA CHENOWETH did the research. Listen to my 2019 conversation with her about her book WHY CIVIL RESISTANCE WORKS: The Strategic Logic of Nonviolent Conflict.