Current policy and practice directed towards people with learning disabilities originates in the deinstitutionalisation processes, civil rights concerns and integrationist philosophies of the 1970s and 1980s. However, historians know little about the specific contexts within which these were mobilised. Although it is rarely acknowledged in the secondary literature, MIND was prominent in campaigning for rights-based services for learning disabled people during this time. This article sets MIND’s campaign within the wider historical context of the organisation’s origins as a main institution of the inter-war mental hygiene movement. The article begins by outlining the mental hygiene movement’s original conceptualisation of ‘mental deficiency’ as the antithesis of the self-sustaining and responsible individuals that it considered the basis of citizenship and mental health. It then traces how this equation became unravelled, in part by the altered conditions under the post-war Welfare State, in part by the mental hygiene movement’s own theorising. The final section describes the reconceptualisation of citizenship that eventually emerged with the collapse of the mental hygiene movement and the emergence of MIND. It shows that representations of MIND’s rights-based campaigning (which have, in any case, focused on mental illness) as individualist, and fundamentally opposed to medicine and psychiatry, are inaccurate. In fact, MIND sought a comprehensive community-based service, integrated with the general health and welfare services and oriented around a reconstruction of learning disabled people’s citizenship rights.