In this paper, we document the counter-data action and data activism of a grassroots affordable housing advocacy group in Atlanta. Our observation and insight into these data activities and strategies are achieved through ethnographic and engaged research and participatory design. We find that counter-data action through community-collected data is rooted in a legacy of Atlanta’s black activism and black scholarship; that this data activism enabled resource mobilization and critical conscious making; and that design and media production are essential post counter-data (...) action activities in data activism. Based on these findings, we urge the field of open government data to broaden their concept of social impact of data to include the use data to mobilize resources within oppressed communities not to influence policy and government but to build capacities within community in order to transform, not join, political structures. We also advocate that scholars within the fields of open government data, critical data studies, and data activism recognize the legacy and historic practice of data activism by black communities working towards social change. (shrink)