Civic-led banishment, a fundamentally spatial punishment, is an understudied phenomenon in South Africa and beyond. We define it as "a punitive spatial practice, enacted by non-state actors in response to alleged criminality or deviance, which attempts varying degrees of socio-spatial expulsion over time". This definition lays the framework for a socio-spatial analysis of punishment, and yields insights into the exercise of socio-spatial control in public and private space. We emphasise the specific challenges associated with banishment, together with the relationship between space, punishment, public authority, and sovereignty. We demonstrate how "negotiations" around banishment trade off two forms of intersecting precarity: those faced by residents in informal settlements and the potential precarity of public authorities. Finally, we argue that an exploration of all forms of punishment through the lens of sociospatial expulsion enables us to tap into conversations around penal abolitionism.