A recent letter from 21 state Attorneys General to various asset managers demonstrates a focus on using antitrust and unfair competition laws to oppose ESG efforts. In this Client Alert, Latham & Watkins attorneys review the major enforcer and congressional statements over the past year that have raised antitrust and competition concerns with ESG initiatives; analyze how the AG Letter reflects a refinement of theories of harm under state and federal competition laws; and provide guidance to entities implementing ESG policies on how to minimize legal risks.