Final answer:
A. Philip Randolph played a large role in FDR's decision to ban racial discrimination in the defense industries.
Step-by-step explanation:
The individual with his "Double V Campaign" who played a large role in FDR's decision to ban racial discrimination in the defense industries was A. Philip Randolph. He was an influential civil rights leader and labor organizer, best known for his efforts to end racial discrimination in the American labor movement. Randolph's campaign put pressure on President Roosevelt to issue Executive Order 8802, which prohibited racial discrimination in the defense industries.
Learn more about A. Philip Randolph and the Double V Campaign