To scholars and social critics, the racial segregation of our neighborhoods has long been viewed as a manifestation of unscrupulous real estate agents, unethical mortgage lenders, and exclusionary covenants working outside the law. This is what is commonly known as �de facto segregation,� practices that were the outcome of private activity, not law or explicit public policy. Yet, as Rothstein breaks down in case after case, private activity could not have imposed segregation without explicit government policies (de jure segregation) designed to ensure the separation of African Americans from whites.