In To Kill a Mockingbird we see Atticus Finch make considerable sacrifices to defend the accused negro Tom Robinson. He is threatened, his children are taunted at school and he is sneered at for "lawin' for niggers". He defends Tom Robinson despite the damage it does to his reputation in the small town and the strain it places on his family. However, he does it because he believes in American justice and he wants to see it properly delivered in the community in which he lives.
In a similiar way we see Bobby Delaughter, an assistant district attorney in more modern day Mississipi, take on a case which could do considerable damage to his reputation and career. White supremacist Bobby De La Beckwith has already escaped a guilty verdict from two trials for the murder of civil rights activist Medgar Evers. However, Delaughter believes that fresh evidence will finally see justice being served in a new trial. He faces considerable opposition in this undertaking from those in the community who would prefer to see the past buried (including his own wife).
We can see therefore that in both texts there is a determined quest from the main characters to seek racial justice, despite the considerable strain it places on their professional and private lives.