The fact that they are latino in wiscnsin and speak little English does not, in and of itself, make them illegal. Just because you don't hear them speaking English doesn't mean they don't know how. They may also have temporary work visas.

With the housing boom this situation has really gotten out of hand. From firsthand info I have gotten from my friends who do/have worked construction crews, the typical immigrant crew charges the contractor roughly 1/4of what the low end resident crews do. Note, that based on low end. My friend Joey stopped framing houses for $1.25 per square foot (thats low end, it goes anywhere from 1.00-2.50 depending on the home) and instead moved over to concrete framing. Why? A
latino crew of 20 men were offering the local home building contractors .30 cents per square foot. 30 cents, man. It took 8 ppl a week to do a 4 bedroom 2 bath, so it takes these guys 3 days or so. there is no possible way you can charge 30 cents per square foot and be paying everyone, at minimum, the minimum wage and be paying taxes on them. It's simply not possible.

The demand for this shoots all the way up the food chain, from the building contractor, to the real estate company, to the homebuilder.

The blame lies with more than the illegals.