The present investigation examined how individuals higher in social dominance orientation (SDO) react to experimentally induced intergroup threat in terms of support for helping immigrants. Participants read editorials describing an incoming immigrant outgroup posing realistic threats (to tangible resources and well-being), symbolic threats (to values and traditions) or no threats. Participants higher in SDO exhibited greater resistance to helping immigrants upon exposure to realistic, symbolic, (Experiments 1 and 2), or combined realistic-symbolic (Experiment 2) intergroup threats, but not when the same immigrants posed no threats. In Experiment 2, SDO exerted indirect effects on modern prejudice through both heightened infra-humanization and intergroup anxiety, with modern prejudice itself predicting greater resistance and indifference to helping immigrants. Moderated mediation analyses revealed strongest SDO-infra-humanization relations under conditions of symbolic threat. Implications for prejudice-reduction interventions are considered. Copyright # 2010 John Wiley & Sons, Ltd.Despite increasing immigration rates, broadening immigration policies, and acclaimed preferences for multiculturalism, immigrants continue to face resistance by host societies (Reitz & Banerjee, 2007). Discrimination clearly affects the ability for immigrants to integrate successfully, creating a pressing need for research on the acceptance and integration of immigrants into host societies. In the present investigation, we explore how person and situational factors affect the willingness of host society members to help an incoming immigrant group.Ideological orientations that maintain intergroup status differentials are particularly relevant to this discussion. According to Social Dominance Theory (SDT), human societies are naturally characterized by hierarchical power structures, with dominant social groups motivated to endorse ideologies justifying intergroup hierarchies and social inequality (Pratto, Sidanius, Stallworth, & Malle, 1994). Central to SDT are broad hierarchy-enhancing myths, such as prejudice (e.g., racism, sexism), that serve to legitimize the subordination and discrimination of groups lower in the social hierarchy (Sidanius & Pratto, 1999). Within the broader SDT framework, social dominance orientation (SDO) represents an ideological orientation toward intergroup dominance that differs among individuals. Those higher in SDO see the world as a ''competitive jungle '' (Duckitt, Wagner, du Plessis, & Birum, 2002) perceiving outgroups as sources of threat (Esses, Hodson, & Dovidio, 2003). SDO is one of the most potent individual difference predictors of prejudice (Altemeyer, 1998;Sidanius & Pratto, 1999), particularly toward ''inferior'' outgroups seeking higher status (Duckitt, 2006). Relevant to the present context, heightened SDO predicts negative attitudes toward immigrants (Costello & Hodson, 2010;Hodson & Costello, 2007), and favorable attitudes toward policies stressing dominance over immigrants (Pratto & ...