 Two years after Duke Slater retired, the NFL enacted an unofficial color ban; no African-Americans appeared in the NFL from 1934-1945.Slater helped give black football players a place to play by assembling and coaching several all-star teams of African-American players.Slater served as head coach of the Chicago Negro All-Stars (1933), the Chicago Brown Bombers (1937), the Chicago Comets (1939), and the Chicago Panthers (1940).