"The enlargement of the European Union in 2004 increased the flows of workers across national borders within the unions, making action against social dumping an increased priority for unions. Which factors influence unions' choices of strategies against wage dumping? Research has shown that in a cross-national perspective, unions with stronger institutional positions, defined as their influence on public policy and extent of collective bargaining coverage, have tended to be less interested in organising migrant workers than unions with weaker institutional positions. This article examines the choices made by three Swedish unions, all three with strong institutional positions, in responding to migrant workers: two have developed extensive organising responses, while the third relies on cooperation with employers and collective bargaining coverage to counteract social dumping. The article shows that intra-national variation can be explained by sectoral-based issues: that is, variation at both a country and sectoral level influences unions' strategic choices towards migrant workers. The article further highlights the transference of the Anglo-Saxon union revitalisation model in some sectors of the Swedish trade union movement, which faces increasing pressure as a result of labour precariousness in the Swedish labour market. "

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