The social mechanisms in ideological groups work to promote a cohesive social unit and present significant barriers to disengaging. Nonetheless, involvement in these groups is often not a lifelong commitment and many members do leave. The aim of this study was to explore the personal experience of the exiting process from a diverse range of ideological groups, and to construct a theory of disengagement, through 27 in-depth interviews with former members of 1% motorcycle clubs, military special operations forces, cults, white supremacists and fundamental religious or political groups.