This chapter argues that Plato’s mature political philosophy is essentially biopolitical, representing, in particular, what Foucault identifies as biopolitical state racism. A state racist mentality looks at the population as a gardener looks at her garden: without weeding, the garden does not flourish. In Plato’s view, this mentality is lacking in the Greek democratic city-state in which the weeds (the inferior many) repress the flowers (the superior few), but it is not altogether absent from Greek society, as Plato discovers it in a variety of practices from selective animal breeding to the medical art of surgery. From these practices, Plato argues, we learn that only the elimination or the expulsion of the incurable members of the community suffering from physical and/or mental defects or diseases enables the community to become happy and flourishing. For Plato, such a “state purge” (katharmos poleōs) is not a mere political option but the necessity of natural justice.