(CNN)Lupe Fiasco has a message for white supremacists: There is nothing "supreme" about you.
The rapper used his Instagram account to post an open letter that began "Dear White Supremacy."
"First of all you are not really that supreme," he wrote. "While throughout history White Supremacy it must be admitted you have achieved some very dominant positions. These positions have been gained mostly through force or some biological agent such as disease that did a lot of the dirty work for you in advance."
The three-part posting contained images of Dylann Roof, who has been charged in the slaying of nine people last week at Emanuel African Methodist Episcopal Church in Charleston, South Carolina.
Fiasco's note came amid news of a website containing a racist manifesto and 60 photos that have become part of the investigation into Roof.