While there is a wealth of literature on radical adult ‘popular’ education for change, most of it looks forward and speculates on the educational processes best able to help ‘the oppressed’, ‘excluded’ or ‘disadvantaged’ become critically‐aware ‘subjects’ of social change. Within a critical education framework, recent research looked in the opposite direction, identified adult activists already critically‐aware and worked backwards through their life histories to find the educational experiences seen as most influential in their development. Examining questionnaire responses, this article analyses how members of the Scottish Socialist Party perceived the influence exercised by their teachers, from primary to tertiary education, in the development of their beliefs and identity as activists. Comparisons are made with research in ‘active citizenship’. The research suggests there is more potential for radical education within the formal sector than is often believed and teachers contribute to this process in sometimes contradictory ways. The findings feed into debates in the UK and other countries, particularly in Latin America, about where popular educators should direct their energies, within state structures or outside, in social movements.