Modes of access and tools to manipulate data have brought marginalized actors to collaboratively create alternative narratives to those delivered by dominant power structures. Non-profit organizations and activist groups increasingly base their campaigns on data, using visualization as an agency tool for change. Data-driven alternative narratives counteract the hegemony of information, questioning the status quo and promoting the non-flattening of the data society, seeking to strengthen democracy. Data visualization is a decisive adversarial tool (DiSalvo, 2012) for turning data into alternative narratives. Translating data into visual representations for alternative narratives is an activist practice that requires a critical approach to data to make a political position evident and coherent.