Abstract
Sociological research has established the harmful effects of disrupting ethnic and other social structures in the central city. Proposals to redistribute urban poor in middle class suburbs may repeat these errors. Cassel and others have correlated various diseases with disordered social relationships that often accompany migration. Physical and social stress are shown to be least harmful to all classes when familiar group support is present; also the effects are most severe on individuals with lowest social status. Where a strange population is introduced into the territory of an indigenous one, social health and stability require protection of the cultural integrity of both groups. Legal and institutional changes of this sort should be accompanied by careful application of what might be called current anthropology or human ethology.

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