STS scholars studying anti-nuclear activism in the context of nations in the Global North have observed the critical role of science to mediate relations of domination and resistance. Through a historical examination of anti-nuclear activism in India, this article investigates the instrumentalization of science as a liberal democratic rationality. In doing so, the article shows how elite Indian activists-many of whom are scientists, engineers, journalists and academic professionals-will never be seen as scientifically knowledgeable in nuclear matters, because of their non-state educational pedigrees. If activists cannot hold the state accountable through science, they have attempted to anticipate what other kinds of arguments and modes of contention may gain traction. As such, they have deployed more 'guerilla' tactics grounded in bureaucratic rationalities in the hopes of installing themselves as alternate sources of expertise in India's nuclear landscape.