The Home Owners Loan Corporation, established by FDR in 1933, creates a “scientific” means for appraising property: “Four categories of quality...with corresponding code letters of A, B, C, D and colors of green, blue, yellow, and red--were established. The First grade (also A and green) areas were described as new, homogeneous, and ‘in demand as residential locations in good times and bad.’ Homogeneous meant ‘American business and professional men.’ Jewish neighborhoods, or even those with an ‘infiltration of Jews,’ could not be considered ‘best’ any more than they could be considered ‘American.’” (197)

(Jackson, Kenneth T. Crabgrass Frontier: The Suburbanization of the United States. New York: Oxford University Press, 1985. Print.)