 Historians themselves have obligations of truthfulness and objectivity in the accounts they provide of the past. This topic has occupied much of the discussion of history and ethics in the past few years (Fay 2004). Much of this discussion has centered on the intellectual virtues to which historians need to aspire, such as truthfulness, objectivity, and persistence (Creyghton et al 2016, Paul 2015). Perhaps more generally, we might argue that historians have an obligation to deliberately and actively include those aspects of the past for further research that are the most morally troublesome—for example, the origins and experience of slavery during the eighteenth century in the American South, or the role of the Gulag in the Soviet Union in the twentieth century. We may reasonably fault the historian of the American South in the nineteenth century who confines her investigation to the economics of the cotton industry without examining the role of slavery in that industry, or the historian of the USSR who studies the institutions of engineering research in the 1950s while ignoring the fact of forced labor camps. Historians have an obligation to squarely confront the hard truths of their subject matter.