There's a lot of assumptions here.

Significant isn't specific. A specific number would give us an idea if the rate of crime committed by undocumented persons exceeds, meets, or continues to fall short of the other two groups.

Next, you're assuming that the victims of violent crimes by undocumented workers are other undocumented workers. This, to some degree makes sense. But it's not 100%.

Next, poverty in of itself isn't sufficient to predict rates of crime. Crime is a choice taken when there aren't other avenues available. Arguably, the reasons undocumented peoples move here is because their prospects are better here. That is to say, they chose to leave their people to come here instead of staying there and commiting crime. This isn't, obviously, specific. But it's a factor you didn't consider.

Finally, what do you mean by class? There's a lot of usages.

This isn't an argument to say you are wrong. It's an argument that you have been specific or open to other factors.