But those who lied to the minority will make em turn inside they grave
from Big Sean (Ft. James Fauntleroy, Kendrick Lamar & Royce Da 5'9") – 100 Lyrics on Rap Genius
Meaning
Continuing from the pervious line, Kendrick feels the people (minorities) who sacrificed their lives for equal rights (15th Amendment granted “equal” voting rights) would be very disappointed that they fought so hard for a system that is now very corrupt/dishonest.
Begs the question: why participate in the system? It’s not for the sake of those who fought.
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