The broadening of the anti-discrimination legislation and the growing use of litigation have put pressure on organizations to respond to the law by elaborating formal rules and, in the case of France, negotiating collective agreements on union rights. This article addresses the issue of union victimization by investigating the various organizational responses to anti-discrimination law. By focusing on in-depth case studies over a long period of time, it offers new insights into the processes whereby law is internalized and how they interact with litigation over time, and also highlights the active, contested and changing role of HR professionals and trade unionists in the shaping of organizational responses.