As a bricklayer, I've watched more than a few companies work illegals( no ssi# etc.) for labor and pay them cash...I have to blame that on the people who hire them. But it did bring the pay scale down for non-union bricklayers in the late 90's and soon alot small companies were taken over by this and couldn't compete with the prices.
As a frequent, innercity titti bar patron and lover of prostitutes, I say non child bearing females between the ages of
17 and 19 who work these jobs should be givin legal status and encouraged to bring over female friends who also want to persue this type of work.