There is a famous story about how Hall of Fame wide receiver John Stallworth came to be a member of the Pittsburgh Steelers—and how he was available in the fourth round. Part of the greatest single draft class of all time in 1974, Stallworth came out of a low-profile HBCU in Alabama A&M, which has only ever produced 18 NFL players, and 12 draft picks, of which he is the second-highest.
He probably would have been higher had it not been for Steelers super scout Bill Nunn, who had decades of inside connections with HBCUs through his All-America lists in the Pittsburgh Courier.