"This paper explores trade union strategies to protect wages in the face of EU migration after the enlargement of the European Union. We argue that unions have three instruments at their disposal to deal with the risks linked to downward wage pressure: closure through immigration control, equalisation through collective bargaining and minimum wages, and the organisation of migrant workers. Using comparative case studies of Sweden, Germany and the UK, we show how different types of power resources shape union strategies: unions with substantial organisational resources (in Sweden) relied on a large membership to pursue an equalisation strategy and expected to be able to ‘afford' openness. German unions with low membership but access to the political system pushed for a mix of closure and equality drawing on political intervention (e.g. minimum wages). British unions, unable to pursue either, focused their efforts on organisation."

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