South Central Los Angeles
The little red dots represent single family properties that were financed by (now) defaulted HUD-held mortgages, and then bought up at less than market pricies -- these patterns of HUD defaults occurred in the areas that the crack cocaine epidemic ravaged Los Angeles per the award-winning Dark Alliance Stories by Gary Webb.
For further background see Former Bush Assistant Secretary for HUD Reveals “Ethnic Cleansing” Connected to CIA Drug Dealing in Los Angeles and Narco Dollars for Beginners, by Catherine Austin Fitts.