The Global Dynamics of Racial and EthnicMobilization. By Susan Olzak. Stanford: StanfordUniversity Press, 2006. 288p. $55.00.

Susan Olzak's new monograph is a milestone in comparative research onethnic mobilization and conflict. Not only does it chart newtheoretical and methodological territory. It also offers the mostrigorous proof yet that globalization promotes collective action byethnic groups. The book's main claim is that transnational networksdiffuse “ideologies, strategies, tactics and leaders” rapidly acrossnational borders, enabling ethnic mobilization and “leavingpolitical regimes more vulnerable to internal challenges” (pp. 32,152). Global processes, in other words, interact with forces at thegroup and state level to promote violent and nonviolent activism bycommunal groups.