Many governments and corporations have embraced information disclosure as an alternative to conventional environmental and public health regulation. Public policy research on transparency has examined the effects of particular disclosure policies, but there is limited research on how the construction of disclosure policies relates to social movements, or how transparency and ignorance are related. As a first step toward filling this theoretical gap, this study seeks to conceptualize disclosure conflicts, the social processes through which secrecy is challenged, defended, and mobilized (...) in public technoscientific controversies. In the case of shale oil and gas development in the United States, activists and policy makers have demanded information about the contents of fluids used in the extraction process and the routes of oil shipments by rail. Drilling and railroad companies have resisted both demands. Studies of such disputes reveal the dynamic and conflictual nature of information disclosure. In both cases, disclosure conflicts unfold dynamically over time, reflecting power disparities between industry groups and their challengers and requiring coalitions of activists to pursue multiple tactics. When a disclosure policy is established, it does not resolve social conflict but shifts the focus of struggle to the design of information systems, the quality of disclosed data, and the knowledge gaps that are now illuminated. (shrink)