Six million devils just died from the Bubonic Flu
Or the Ebola virus,

from GZA (Ft. Ghostface Killah, Killah Priest & RZA) – 4th Chamber Lyrics on Rap Genius

Meaning

Deadly plagues (the Bubonic plague is commonly known as Black Death) and diseases which do not have cures and are almost certainly lethal

Specifically here, ‘Devils’ is slang for white people

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