See reply #187.
Since estimates are that 1/2 the folks in construction and building maintenance are illegal wage slaves of the capitalist stooges, I suspect that we would have to demolish a large fraction of the homes and offices constructed in the US in the last 10-15 years.
I would guess that a lot of the folks I see around Washington DC who do grounds maintenance are of questionable status. There is not a large hew and cry among the local unions about all of the leaf-blowing and grass-cutting jobs being filled at substandard wages. In fact, my guess is that the employers pay market wages for labor.