This article introduces the special issue on ‘Collective redress in labour law’. Even the best labour code in the world would be practically useless without procedural rules to enable its enforcement. The contributions in this special issue show that, while the mechanism of collective redress certainly functions with mixed results and often is underused in practice, it is nevertheless a valuable tool in the enforcement toolbox, where available. It might be particularly useful for some groups of workers, such as those who lack individual means for asserting their employment-based rights in their own name. While not an answer to all problems, and undoubtedly, not sufficient to close the justice gap for many European workers on its own, collective redress, if adequately constructed, could complement and improve existing enforcement mechanisms in both national and EU labour law.