In the book To Kill a Mockingbird, Atticus Finch is expected to defend Tom Robinson in Chapter 9 when:
This refers to the discrimination of a group of person based on their race and skin color.
With this in mind and from knowledge of the book, we can see that Tom Robinson, a black man was accused of a crime and based on the evidence, he was innocent of the accusation but because of the prevalent racism, he was going to be found guilty regardless of the evidence.
As a result of this, a white man Atticus Finch decides to become his lawyer and defend his innocence even though he knows this is a waste of time but he is determined to make a difference and show his children the right thing to do.
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