The American regulatory system is unique in that it expressly relies upon a diffuse set of regulators, including private parties, rather than upon a centralized bureaucracy, for the effectuation of its substantive aims. In contrast with more traditional conceptions of private enforcement as an ad hoc supplement to public law, this Article argues that private regulation through litigation is an integral part of the structure of the modern regulatory state. Private litigation and the mechanisms that enable it are not merely add-ons to our regulatory regime, much less are they fundamentally at odds with it. Yet mechanisms of enforcement attendant to private suits are being restricted in numerous ways, and on numerous fronts, in the form of pro...