Decapitated they’re trying to cut our jugular vain
That’s the sacred lifeline from the heart to the brain
Make us blind to mankind’s suffering pain
Jugular veins, are veins that run through the neck bringing deoxygenated blood from the head back to the heart. Hence decapitation would prevent necessary blood flow.
However, Ali does not mean this in a literal sense.
He is implying that they (the government) are trying to make us only use our brain(what benefits me most) without using our heart(thinking about what is right and wrong and how it affects others).
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