This chapter examines the activism of residents of Love Canal, New York, in response to the 1976 discovery of 21,000 tons of buried toxic waste in their community. It concentrates especially on the work of the Love Canal Homeowners Association. Love Canal residents understood the health of the human body through an assemblage of epidemiology, toxicology, and personal experience. They perceived the individual as the marker of community health, environmental reality, scientific legitimacy, and government responsibility, in the process coming to see the entire world as environmentally vulnerable. Their conflicting interpretations of citizenship rights illustrated how they were torn between the conviction that everyone had the right to environmental health, and the belief that the needs of national citizens should be prioritized.