A sociological study first lays out a theory of group psychology and intergroup contact, then applies it to American history to explain patterns of intolerance toward Jews. It traces religious and social prejudices, the emergence of racialist anti-Jewish movements after the World War, and related reactions such as the Ku Klux Klan; it examines responses organized against anti-Semitism and concludes with reflections on prospects for tolerance and the development of the American over-group. Chapters combine theoretical analysis with historical application to account for causes, expressions, and possible remedies for anti-Jewish sentiment in the United States.