So, 56 employees living in a couple of houses.... Yeah, nothing going on there.
That happened here in southern NH about a decade ago, but it wasn’t Uncle Sam that found it. An older 4 bedroom farmhouse was rented out to a Chinese family that owned a couple of restaurants nearby. But instead of them moving in, they moved in more than a dozen of their employees who lived in Boston. But they would cycle through the house working 5 day shifts and going back to Boston the other 2 days. The only neighbor on the dead end street got suspicious seeing all of the different cars and people coming and going to the house that they called the Police. After some surveillance, an early morning Police visit found 13 people sleeping there, with mattresses on the floor in every room but the kitchen. The story did not say anything about them being there legally or not, but both restaurants closed within a few months and I believe the restaurant owners had to pay the landlord a lot of $$$ to repair the house, as the house had been trashed.