Violence, either real or threatened, is a part of everyday life for the Joads. Are they violent among themselves? Is their violence premeditated? Does it achieve its goal? Find examples of where their violence is justified or unjustified.

Yes, violence is prevalent but seldom among the sharecroppers themselves. Most all of the violence takes place when the companies hire union breakers to intimidate the workforce. Issues surrounding Casey and Tom make up the bulk of violence. The union busters cause a stir at the dance (at the government camp), but that is quickly quietened. I think for the most part the violence inflicted on these people was effective. The sharecroppers had no power to fight back with. They were intimidated and largely worked for what they were given. Both Tom and Casey tried to be peaceful. I would imagine that when their lives is being immediately threatened, fighting back is their only choice.

I've seen this post, as it is of great help, I would like a different answer.

Most of the violence in this novel comes in the form of government sheriff's deputies and Union reps. The workers live in concentration camp like hovels; they're hungry and dirty. Many families are starving. There are too many people and too few jobs. Complaining about conditions or accomodations labeled one a trouble-maker.... an agitator, a label that invited punishment. Those who questioned the law of the land were welcomed by deputies who carried guns and used them..... men who wielded clubs with the intent to harm. Preacher (Jim Casy) is killed for taking a stand, for being a strikebreaker. Tom Joad, however, ultimately finds himself a fugitive and disappears.