The article challenges the stereotype of illegal immigrants as unskilled, low-income workers sneaking into the US. It shows that many undocumented workers are actually well-educated and actively working, not relying on welfare. The perception of a massive influx of immigrants is not accurate, as immigration rates have slowed down. Undocumented workers live in an underground world, making it hard to gather information about them. The study uses data from the US Department of Labor to debunk common misconceptions about illegal immigrants in the US.