The Foucaultian sociologist Nikolas Rose has influentially argued that psychosocial technologies have offered means through which the ideals of democracy can be made congruent with the management of social life and the government of citizens in modern western liberal democracies. This interpretation is contested here through an examination of the 1948 International Congress on Mental Health held in London and the mental hygiene movement that organized it. It is argued that, in Britain, this movement's theory and practice represents an uneasy and ambiguous attempt to reconcile visions of 'the modern' with 'the traditional'. The mental hygienist emphasis on the family is central. Here it appears as a forcing-house of the modern self-sustaining individual. Mental hygienists cast the social organization of 'traditional' communities as static, with rigid authority frustrating both social progress and the full emergence of individual personality. Yet mental hygienists were also concerned about threats to social cohesion and secure personhood under modernity. If the social organization of 'traditional' communities was patterned by the archetype of the family, with its personal relations of authority, mental hygienists compressed these relations into the 'private' family. Situated here they became part of a developmental process of mental adjustment through which 'mature', responsible citizens emerged. This reformulation of the family's centrality for the social order informed mental hygienist critiques of the growth of state power under existing forms of democracy, as well as suspicion of popular political participation or protest, and of movements towards greater egalitarianism.