I never heard of them til now and I have always been interested in serial killers and their motives.

Everyone knows all about the infamous white serial killers but hardly anyone knows the black serial killer, Samuel Little, who killed upwards of 93 women over a span of 3 decades. He died recently in jail. Almost all his victims were black but the media never reported on him like they do with white serial killers despite Little killing the most women of any serial killer in this country https://en.wikipedia.org/wiki/Samuel_Little