At the heart of the Thesmophoria festival lies the story of Persephone and the promise of agricultural fertility, but scholars point out that more seems to be at stake, suggesting that the scene of women ‘camping out’ in the sanctuary under the control of the female archons recalls a primitive time when women, perhaps, ruled the city or that the festival creates a place where women are at least beyond the control of men. There are hints, moreover, that during the Thesmophoria women were also actively involved in some kind of juridical activity, especially on the second day of the festival, when they fasted in imitation of Demeter's grief over the abduction of Persephone and the injustice perpetrated against her. Indeed, the epithet Thesmophoros was understood already in ancient times to have some connection with human law. This paper argues that on the second day of the festival women engaged in some kind of impromptu juridical procedure aimed at solving crimes and punishing anonymous wrongdoers and it uses as evidence Aristophanes' Thesmophoriazusae and a series of curse inscriptions deposited in late Hellenistic times at the Sanctuary of Demeter at Cnidus, as well as a few single examples from Locri, Amorgos and elsewhere.