From its earliest days, environmental justice research has been rooted in the social movement that gave its name to the field. Grassroots activists against income and racial discrimination in the placement of environmental pollutants—and the overlooking of low-income and communities of color for environmental amenities—have enlisted toxicologists, demographers, engineers, and public health scholars to uncover damages. Whether in Flint, Michigan or Jackson, Mississippi, scholars have found that community activists have been some of the most effective harbingers of change in their areas. Policymakers should explore partnering with community activists to successfully enact change and end the environmental injustice that plagues regions throughout America.