Labor unions in France and the U.S. opposed certain restrictionist immigration policy measures in the late twentieth century, whereas they had pressured for restrictionism in the early twentieth century. Leah Haus asks why unions changed coalitions. Haus argues that one needs to focus on the challenges of internationalization to explain this change. Many union leaders consider economic internationalization and/or the internationalization of human rights as undermining the effectiveness and/or desirability of certain restrictionist measures. At the same time, many union leaders see support for...