Niklas Bruun is Professor of Private Law at the University of Helsinki. He is the Director of the research programme Regulating Markets and Labour (ReMarkLab), Stockholm University, and member of the Centre of Excellence in the Foundations of European Law and Polity, University of Helsinki.Klaus Lörcher is former Legal Adviser to the European Trade Union Confederation (ETUC) and former Legal Secretary of the Civil Service Tribunal of the European Union.Isabelle Schömann is senior researcher at the European Trade Union Institute (ETUI).They are all members of the Transnational Trade Union Rights Experts Network of the European Trade Union Institute (ETUI).