This is the first history of public health surveillance in the United States to span more than a century of conflict and controversy. The practice of reporting the names of those with disease to health authorities inevitably poses questions about the interplay between the imperative to control threats to the public’s health and legal and ethical concerns about privacy. Authors Amy L. Fairchild, Ronald Bayer, and James Colgrove situate the tension inherent in public health surveillance in a broad social and political context and show how the changing meaning and significance of privacy have marked the politics and practice of surveillance since the end of the nineteenth century.