Since 2014, the #BlackLivesMatter movement has worked to initiate police reforms designed to increase accountability and reduce the extrajudicial killing of Black and brown people. However, policy designs are typically congruent—meaning the allocation of benefits and burdens is generally aligned with how the target group is perceived by society. How could the movement motivate policy noncongruent action that would likely burden police—a group privileged by their position within a congruent, punitive, and racialized criminal justice policy culture? An examination of the innovation and diffusion of 12 noncongruent police reforms from 2014 to 2020 suggests the movement’s demands (1) reoriented the political and social contexts that fueled past diffusion processes, (2) activated key institutional actors—Black lawmakers—who served as entrepreneurs in state institutions, and (3) reactivated innovative states to serve as “leaders” in a new wave of noncongruent reform. This analysis provides a useful framework to understand how marginalized communities and their allies can exact real policy change in a political environment known for its unresponsiveness to the demands of marginalized groups.

What effect does black politics in the United States have on the attitudes of black citizens in other national contexts? Literature on the black diaspora and transnationalism has characterized cultural and political linkages between black communities in North America, the Caribbean, and Europe, especially during the mid-20th century. In this article, I exploit random timing in the administration of a public attitudes survey to demonstrate that such linkages persist and that the police killing of Eric Garner in 2014 negatively affected black Londoners’ attitudes toward the Metropolitan Police. Notably, I find the effect was largely concentrated among black Londoners: estimates of an effect on white and South Asian Londoners were small and largely insignificant. The evidence presented here demonstrates that racial violence in the United States can affect racial politics in other national contexts and helps frame the emergence of Black Lives Matter chapters and protests beyond the United States.

This paper examines the ways that social movement organizations affiliated with the Black Lives Matter (BLM) movement use Twitter through three content analysis studies. The main finding presented in the paper is that the modal tweet generated between December 1, 2015 and October 31, 2016 was an emotional response—an expression of sadness, outrage, or despair—to police brutality and the killings of African Americans. The second key finding is that BLM organizations generated more tweets that framed the movement as a struggle for individual rights than ones that utilized frames about gender, racial, and LGBTQ identities. Finally, the paper shows that BLM activists urge their followers to pursue disruptive repertoires of contention less frequently than they encourage other political behaviors. These findings suggest that the BLM movement is intelligible through both the resource mobilization and new social movement paradigms within social movement studies.