The Joads are told that they would not get paid in cash right away, but that they would receive credit at the company store. How were company stores another way that the poor were taken advantage of?
When Tom meets up with Casey, Casey has become a union organizer. Explain how "uniting" (creating a union) gives the workers any more power than they had before. Explain why it is sometimes difficult to get the workers to support the union that is actually trying to help them.
After Tom kills a man he feels no regret. Does this change your opinion of whether he is a good person or not? Many people feel it is "good" to kill other human beings in times of war, in self defense or as a death penalty. How would you justify or condemn Tom's action when he killed another man? Earlier Casey told his killer that he was "starving children." Should it be considered "murder" if an employer pays so little that his or her employees can not survive and feed their children?
Food for thought... The American Revolution was fought to end exploitation by England. Is killing exploiters an acceptable reaction to exploitation?
Cartoon Source
Read this article on the working poor.
See this chart to understand the relative purchasing power of the minimum wage over the last 50 years.