"Drawing on case studies in the German metal and chemical sectors, this article addresses trade unions' behavior toward employers' labor market segmentation strategies and, in particular, their use of outsourcing. Findings illustrate that, contrary to the expectations of the dualization literature, trade unions do not always give priority to their core constituency over the interests of temporary or peripheral workers. Union actions are not solely determined by the aim of defending the interests of their current members but depend instead on the interrelationship between unions' identity and their members' and organizational interests."

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