This is a study of prejudice—of unintentional but consistent discrimination against minority groups of hyphenate Americans in one of the last fields one might think to look for it: popular magazine fiction. The fact that it is unconscious prejudice does not mitigate its corrosive effects on the tolerance of readers: it steals in without warning when they are relaxed and unsuspecting. This article is based on a research analysis originally made for the Writers' War Board in 1945. It appears as a publication1 of Bureau of Applied Social Research, Columbia University, with which the authors are associated.