Boo Radley- The mysterious Arthur Radley is blamed for virtually any unexplainable act in Maycomb. Any stealthy small crimes committed in Maycomb were his work.
Because of his past history of apparent mental instability and the forced seclusion within the Radley House that his father strictly enforced, he is accused of everything from being a peeping tom to poisoning pecans. There is no evidence or witnesses to any of these accusations, but rumors persist throughout the town, making Boo a man with no friends or expectations for a better future.
The jury- Tom Robinson is accused of rape by a white family, the Ewells, who have been, according to Atticus, "the disgrace of Maycomb for three generations."
According to Scout, Atticus considers the Ewells "trash," the only time Scout has ever heard her father speak so disrespectfully of anyone in Maycomb. However, the Ewells are white, and Tom is black. In the 1930s Deep South, a white man's word was always accepted over the word of a black man, and this was no exception. Atticus tells his brother, Jack, that "The jury couldn't possibly be expected to take Tom Robinson's word against the Ewells'..." and Atticus was right. Despite a strong defense by Atticus which seems to have shown that Tom could not have attacked Mayella Ewell because of his crippled right arm, the jury overlooked the evidence and found Tom guilty.
Bob Ewell- Bob's racial bias is obvious when he calls Tom Robinson a "nigger" from the witness stand and later tells Link Deas, when warned to leave Tom's widow alone, that he "ain't about to go with no nigger."
The authors’ purpose in To Kill a Mocking Bird is to tell a story about prejudice and discrimination for all races. She is trying to show that no one race is better than the other. She is saying that you should never trust a book by its cover and that you shouldn’t judge people right away.