August 8, 2013 1:22 PM
Two decades after Jackie Robinson broke pro baseball's color line the NFL still had no black quarterbacks, even as African Americans excelled at every other position on the field. It was pro-football's open secret: the quarterback position was for whites only. A handful of pioneers began to change this in 1968 and four of them tell their humiliating and often emotional stories to Armen Keteyian. Watch a preview of the compelling segment of 60 Minutes Sports on SHOWTIME before it airs on Wednesday, August 7 at 9 p.m. ET/PT.