Killing fields need blood to graze the cash cow
from Yasiin Bey – Mathematics Lyrics on Rap Genius
Meaning
“The Killing Fields” refers to the areas of Cambodia where the Khmer Rouge killed and buried hundreds of thousands of people
Figuratively, it stands for the expendability of the populace before government and/or corporate interests (the “cash cow”)

Also a play on Thomas Jefferson’s maxim: “The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants” — except liberty has been replaced with capitalism
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