Studies on transnational social movements in world risk society tend to emphasize their centrality and effectiveness as the result of two major transformations: the decline of the nation-state as a primary locus of power and sovereignty, and the rise of assertive civil societies’ subpolitics. Drawing on the ‘Vanunu affair’ (the Israeli technician who was sentenced to eighteen years in prison for making public Israel’s nuclear secrets), and the reactions it elicited at the local and global levels, the article analyzes the obstacles that may prevent the effective influence of anti-nuclear transnational social movements and their difficulties in contributing to global framing. These obstacles are related mainly to the cultural politics of a ‘secret state’ that constructs national sovereignty, and mobilizes the local civil society, by means of nuclear secrecy and opacity.״