As the migrant families travel west, a union occurs in which all of the families bond to become one. According to the narrator, “[T]he children were the children of all. The loss of home became one loss, and the golden time in the West was one dream.” Unwritten laws and codes come into effect as leaders in the camps emerge. As the migrants journey on, the men change. They are no longer farmers, but migrant men.
The Joads travel along the highway crossing into Arizona. At the state border, a border patrol officer stops and questions them asking if they have any plants. The guard lets them through, and the Joads plow along through the state. At last, the Joads cross the state lines and enter into California.
Meanwhile, Tom, who crawls into a cave to sleep for the night, is confronted by Noah. Noah claims that, although Pa and Ma show love toward him, he is really a burden on the family. He says that he will live off fish from the river and asks Tom to tell Ma. Tom tries to convince Noah to stay, but to no avail.
At camp that night, Granma, who has become deathly ill and delirious, is visited by a group of Jehovah’s Witnesses who ask to pray over Granma as she dies. Ma, in denial over Granma’s death, refuses to let the Jehovites into the tent say that Granma is only “tar’d.” The woman says they will go to their own tent and “forgives” Ma for her “hard heart.” From another tent, Ma and Rose of Sharon can hear the Jehovites worshipping and shouting. Ma’s behavior and attitude toward the Jehovites bothers her.
A short while later, a police man storms the tent and rudely informs the Joads and Wilsons that they have a day to leave the area. However, Sairy Wilson, whose health has been failing, is unable to make the journey. In a poignant scene in the novel, Sairy asks Casy to visit her and say a prayer over her. She enjoys his company. As the Joads pack up to leave, Pa gives Ivy two bills and some food.
Later that night, the Joads are stopped by police to be inspected for produce. Before they have a chance to search the behicle, Ma comes out from the back saying that Granma is deathly ill and desperately needs of medical assistance. The guards, upon seeing Granma, let her pass. The Joads travel all night. In the morning, Ma lets it known that Granma died before the checkpoint. In order to ensure the family get across safely, she lay with the body all night.
Because the family is low on money, the Joads do not properly bury Granma’s body but leave it with the local coroner. At the next Hooverville, Tom meets Floyd and asks him why, despite mistreatment, low wages, and a shortage of jobs, they men don’t organize. Floyd explains that the police are quick to put a stop to any attempt at unions and any man who attempts to form one is blacklisted and is unable to find work.
In the tent, Connie expresses his displeasure with California to Rose of Sharon claiming that he should have stayed in California. As Ma cooks stew for the family, a group of hungry children gather around the tent asking for food. Ma tells them she has to look after her own family first but agrees to let them lick the leftovers from the pot. Afterwards, a tattered woman from another tent visits Ma and complains to her for feeding the children the stew claiming that by doing so she started up trouble.
A man arrives at the camp saying that he is looking for new workers. Floyd, disgruntled and having fallen for a similar trick in the past, demands to know the wage the contractor will set. The contractor calls on a police deputy who accuses Floyd of robbing a used car lot. Floyd punches the deputy and begins to run. The deputy pulls a firearm and shoots carelessly hitting a woman in the hand, severing her fingers. Tom trips the deputy with his foot and Casy knocks him out. As other police arrive, Casy tells Tom to flee and not get caught as it will be in violation of his parole. Tom flees, and Casy sacrifices himself claiming that he was the one responsible for knocking the guard out.
Uncle John, distraught over an earlier discussion he had with Casy and the preacher’s subsequent sacrifice, requests money to go and get drunk. The family grants his request. Meanwhile, Al reports that Connie took off, grieving Rose of Sharon. Tom comes into the tent and reports that the camp will be burnt down. He goes out to search for Uncle John and is forced to knock him out to get him on the truck.
As the family heads to another city, they run across a group of picketers who have assembled to keep the “Okies” out. This angers Tom, and just as Tom is about to beat one of them with a jack handle, Ma stops him. The Joads turn the truck around and head the opposite direction.