Happened to read this today on a local news site:

"MANASSAS, Va. -- Homeowners in northern Virginia and Maryland have
been losing money to a driveway paving scam.
The FBI says over the last six months, more than 22 homeowners have
hired a group of men to conduct driveway repairs, but the work was
never finished even though the men were paid.

Agents say the men have Irish accents, and they use bogus business
cards. The FBI is asking anyone with information to give them a call at
the D.C. field office at 202-278-2000"

No mention of mexican workers, but sounds familiar anyway.