I'm sorry, this simply is not true. Cheaper perhaps, just wait till the final bill comes in. They often work "harder" because they have no idea how to accomplish the task given to them. They simply attack with an ignorant zealousness that often gets them hurt.
I once witnessed an Illegal use a pick to demolish a small shed. The first swing hit only his shin. I've known printing shops that hire Illegals, the presses are reduced to scrap from the beating they take. "Harder" is not SMARTER!
Ya beat me to the punch, moehoward.
Not being disrespectful to that poster, but that phrase is simply regurgitation of the daily propaganda. I know industrious and lazy illegals, legals, and Americans.
I love it when the "job" won't pass final inspection. The employer has to tear out and hire somebody who actually knows what they're doing. These are US workers of course.