Black baseball players struggled long after Jackie Robinson broke the color barrier

St. Louis Cardinals players Curt Flood, Bill White and Bob Gibson, pictured in 1966, 1962 and 1967, respectively. They are the focus of a new History Channel documentary about the Black baseball players who followed Jackie Robinson into the major league. (AP)

It's often said that Jackie Robinson opened the door for Black baseball players to enter the majors. But that was just the FIRST door. Turns out, a lot of doors stood between Black players and equality.

After Jackie, a new documentary on the History Channel, focuses on three more legends that followed, all with the World Series-winning St. Louis Cardinals of the 1960's: Bill White, Bob Gibson and Curt Flood.