This is a question from to kill a mockinbird , in chapter 15
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Basically they come to the jail to lynch Tom Robinson. THey do this in full view and intend to take their chances with a biased jury later. They want to take revenge on him themselves and they do not want to risk having him be acquitted in a jury trial. It is a little girl, Scout, who calms Mr. Cuningham down and helps disperse the tension.