This chapter explores the relationship between labor activism along global supply chains and labor politics in China. In particular, it investigates the extent to which Chinese workers have been involved in transnational labor networks, and the nature of their involvement. To date there is no systematic documentation of Chinese labor involvement in transnational campaigns, let alone campaigns specifically involving supply chains, in part because the repression of workers and activists by the authoritarian state presents challenges for empirical research. Nevertheless, this chapter offers an original analysis of five global union federations’ inclusion of Chinese labor in their transnational activities. The analysis reveals three categories of global unions’ engagement with Chinese workers or companies: (1) direct cooperation with Chinese workers, (2) solidarity actions on behalf of Chinese workers, and (3) campaigns on behalf of non-Chinese workers employed by Chinese companies. These findings provide a starting point that can inform future research on the relationship between global supply chains, transnational labor alliances, and the politics of workers’ rights in China.