Read this fascinating article published recounting Pepsi's efforts to break down hiring barriers for African-Americans in the 1940s. You don't often get a glimpse of the internal politics around diversity, and almost never at how corporations handled it.
"The rivalry between Pepsi and Coke, which started in the 1940s, is legendary in business. Less known is that a more important battle was being fought on the front lines of the cola wars at the same time: the struggle of African-Americans to gain access to professional jobs in major corporations." [More]