In his biography autobiography "A Long Walk to Freedom", Nelson Mandela describes how racial segregation was enforced even behind bars.
"... In the evening, we were given the same food again, but the Indians and Métis received one hundred grams of bread and we are not at all. This distinction was made based on the strange supposition that Africans did not like the bread. the authorities were so much attention to the problem of color that even the type of sugar and bread provided for whites and the other was not the same: prisoners had white sugar and white bread, colored and black prisoners brown sugar and black bread."