"This article summarizes and reviews research on union responses to precarious work in Europe, based on a systematic coding of 56 case study-based articles published between 2008 and 2019. Analyses of these cases suggest two paths to labour market dualism, with the first involving institutional fragmentation and union division, and the second a combination of weak structural power and partnership-oriented union identities. The authors also identify two paths to solidarity, with the result of reduced precarity for peripheral workers: a conflict-based path and a social partnership-based path. Campaigns to organize migrant workers present distinctive institutional and structural challenges to unions, with studies involving migrants most often finding ‘failed solidarity', in which inclusive organizing fails to reduce precarity. The article integrates these findings with past frameworks on union responses to precarious work and concludes with recommendations for future research."

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