Wouldn't surprise me at all. A lot of legit business interests are big end users of illegals. Meatpacking, agriculture, hotels, construction, landscaping, the list goes on. The huge corporate factory egg farms are among the worst for using slave labor. I would even bet a lot of politicians get fat envelopes under the table from industries that rely on a large, cheap, and expendable labor force.

I had a recent job with a large, well-known manufacturer. I dealt with a lot of incoming product and noticed that some stuff was coming in from very dubious sources at fire sale prices. Wouldn't surprise me a bit if it was from sweatshop labor.