"The literature identifies three key factors that shape attitudes towards immigration: socio-economic uncertainty, ideology and the institutional framework. The aim of this article is to take a closer look at the differences in trade union members' attitudes to immigration and the factors that determine them. We test three hypotheses by addressing three questions. First, what are the differences between the attitudes of trade union members and non-members with regard to immigration? Second, how are attitudes affected by material socio-economic variables? Third, how do different institutional frameworks and contexts affect trade union members' attitudes? We conclude that attitudes can be explained by the interaction between economic and ideological variables. This has important implications for trade union strategies geared towards the integration of migrant workers."

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