The year 2025 marks the 120th anniversary of Lochner v. New York, a 1905 U.S. Supreme Court decision striking down legislative limits on work hours in the baking industry. U.S. scholars generally agree this decision harmed workers and was a setback to the labor movement in the United States. The essay borrows from some of the historian E.P. Thompson’s writings on the relationship between historical inquiry and normative values in order to reflect on Lochner and the relative consensus among scholars opposing the decision. That reflection in turn serves as a point of entry for thinking about the role of normative values in doing labor history, what values we propound in the present by writing and teaching about the history of working-class people, and how those issues relate to different ways labor historians can understand what is arguably our field’s central category, class. The essay suggests that, with regard to the Lochner decision and in general, labor history is something of a different activity if the field’s orientation is toward the amelioration of time- and place-specific problems in working-class people’s lives, toward class as inherently a category of violence and injustice, or both.