The book presents results of an analysis of socio-psychological roots of prejudice against Jews and Gypsies in Hungary and Serbia. After a brief overview of the main theoretical approaches to the problem of prejudice, the analysis focuses on constructing causal models aimed at explaining the role of social and psychological variables in the examined ethnic prejudices, using survey data from Hungary and Serbia. Causal modeling is based on three main socio-psychological approaches to prejudice - personality, social learning, and group-conflict approach. The results suggest that antisemitic and anti-Gypsy attitudes are partly directly transferred from parents to their children via socialization, and that personality (authoritarian aggressiveness) mediates the influence of other factors including socio-economic status variables. The book is relevant for students and scholars interested in social psychology or prejudice, whether they are interested in more general problems of prejudice, or concerned with specific features of anti-gypsy and anti-Jewish attitudes in Eastern Europe.