Marcel van der Linden’s Workers of the World elaborates on the research programme and methodology of global labour history, a field devoted to opposing and rectifying the nationalism and eurocentrism engrained in the historiography of labour. Workers of the World also calls for the development of an ambitious theoretical approach, critically probing the classic Marxian definition of the working class and arguing that the time has come for a reconceptualisation. Many of the issues raised by van der Linden would seem to require further discussion; in particular, it appears that the theoretical and political status of Marx’s definition of the working class merits further analysis and debate.