Contemporary Nigerian vigilantism concerns a range of local and global dynamics beyond informal justice. It is a lens on the politics of post-colonial Africa, on the current political economy of Nigeria, and on its most intractable issues - the politics of democracy, ethnicity and religion. The legitimation of vigilante activity has extended beyond dissatisfaction with current levels of law and order and the failings of the Nigeria Police. To understand the local legitimacy of vigilantism in post-colonial Nigeria, indeed, it is also necessary to recognize its internal imperatives. Vigilantism in this context is embedded in narratives of contested rights, in familiar everyday practices, understandings of personhood and knowledge, and in alternative, older registers of governmentality. In addition to mapping temporal and spatial communities in which young men are vested with the right to exercise justice, this article assesses the legitimacy of Annang vigilantism within cultural frameworks of accountability linked to conceptions of agency, personhood and power, and the oppositions this produces between vigilantes and thieves.