Positive cross-group contact with disadvantaged group members can reduce prejudice, and, under certain conditions, increase solidarity-based action intentions among advantaged group members. In the present work, we distinguish between positive contact (friendly, cooperative) versus politicized contact (where group-based injustice is discussed) as well as between benevolent helping offered to the disadvantaged group versus costly solidarity-based actions. We predict that positive contact is related to benevolent helping, whereas politicized contact is related to willingness to engage in costly solidarity-based activism. In two studies (N = 257, N = 329), results support these hypotheses: for nonmigrants in Germany and the United Kingdom, positive contact with migrants, mediated by empathy, positive emotions, and movement identification, was a better predictor of benevolent helping, whereas politicized contact with migrants, mediated by anger and/or movement identification was a better predictor of endorsement of costly solidarity-based activism.