In 1931 nine African-American teenagers were accused of raping two women on a train. Their eventual trials in Scottsboro were composed of an all white jury. They recieved very poor representation for their cases and in the end, before any of them got a fair trial, eight were dead. Turns out, there was actually substantial medical evidence that the women were not raped, showing, along with the use of an all white jury, that the trials were unjust.
Similar to Atticus's case for Tom Robinson in To Kill A Mockingbird, the Scottsboro boys were treated unfairly because of their race. The court system at the time was very biased against African-American prosecutors and defendants.
They should've given the Scottsboro boys and Tom Robinson a fair trial because in the end if they had, they probably would've had a different outcome.