How Police Behavior Shapes Perceptions of Protests: Evidence from Black Lives Matter

As Black Lives Matter protests swept across the United States in recent years, protesters encountered a mix of police reactions: Some news reports described police in military gear and widespread arrests, whereas others reported minimal police involvement. We developed an original dataset of BLM protests that shows that police reactions varied widely, even when comparing protests with similar messages and tactics. We then investigated this variation with a survey experiment and found that observers are more likely to describe protesters as violent when a protest is met with a heavy police presence. These findings highlight the role of the police in shaping public perceptions of violence and social movements and extend a growing body of empirical research on BLM by shifting the focus from protest activity to the impact of protest policing.