NPR: How The New Deal Created Segregated Inner City Ghettos:

On how the New Deal’s Public Works Administration led to the creation of segregated ghettos

Its policy was that public housing could be used only to house people of the same race as the neighborhood in which it was located, but, in fact, most of the public housing that was built in the early years was built in integrated neighborhoods, which they razed and then built segregated public housing in those neighborhoods. So public housing created racial segregation where none existed before. That was one of the chief policies.

On the Federal Housing Administration’s overtly racist policies in the 1930s, ’40s and ’50s

The second policy, which was probably even more effective in segregating metropolitan areas, was the Federal Housing Administration, which financed mass production builders of subdivisions starting in the ’30s and then going on to the ’40s and ’50s in which those mass production builders, places like Levittown [New York] for example, and Nassau County in New York and in every metropolitan area in the country, the Federal Housing Administration gave builders like Levitt concessionary loans through banks because they guaranteed loans at lower interest rates for banks that the developers could use to build these subdivisions on the condition that no homes in those subdivisions be sold to African-Americans.

Much more at the link. But hey, FDR was a great hero except for this. Well, and the concentration camps for Japanese-Americans.