The enforcement of OFAC-administered sanctions by a state agency—even against banks by a banking regulator operating in a dual banking system—raises fundamental constitutional and other legal questions. Chief among them is the overarching question of whether U.S. states have authority to directly or effectively enforce OFAC-administered sanctions, particularly independently and prior to enforcement by competent federal authorities—namely OFAC. This question and some of the legal issues and policy and practical considerations appertaining to it are discussed in detail in a forthcoming publication. This document provides a summary preview of some of the key legal issues discussed in that publication. Additional summary previews may be provided separately.