An interesting Washington Post story on immigrants--both legal and "undocumented"--organizing for better wages and working conditions. Speaking of one group of workers at a restaurant in New York, the Post describes their wage conditions:

They demanded an end to what they say were salaries less than half the minimum wage, and to penalties that included $20 fines for late deliveries and $50 for shutting the restaurant's glass doors with a bang.

And what were these reported wages? $1.60 an hour. In order to stop these workers from unionizing, the owner of this restaurant reportedly offered them a raise to $4.00/hour.
This story also discusses the increasing use of unions in immigrants' struggles for better pay and says that the number of "day laborer" "worker centers" has "jumped from a few dozen to more than 200 nationwide."