Possible Clues:

• Civil rights org. since 1909
• Racial equality org.
• Org. founded on the 100th anniversary of Lincoln's birth
• Spingarn Medal org
• Anti-discrimination org
• Civil-rights org.
• Image Awards gp
• W.E.B. Du Bois was among its founders
• Spingarn Medal grp.
• Grp. that awards the Spingarn Medal