“An Unjust Law Is Not a Law”

According to Augustine, Aquinas, and Martin Luther King, Jr., an unjust law is no law at all. I’ll call this thesis ULNL, relying more on Aquinas’s version of it than Augustine’s or MLK’s. ULNL is, famously or notoriously, a staple of natural law theorizing. Though sympathetic to what he calls “the minimal content of natural law,” H.L.A. Hart takes issue with ULNL in The Concept of Law on both theoretical and deliberative grounds. Continue reading