Senator Chuck Grassley (R-IA) wants to know, and he sent a strongly-worded letter to DHS Secretary Michael Chertoff. Details here, a copy of the letter here, including this question:

...Second, I would like you to reassure me that no federal funds from the Department of Homeland Security are being used to establish any day labor center or "hiring hall," not just in Herndon [VA] but throughout the United States. According to a July 18, 2005 article in The Wall Street Journal ("Immigration workers attract attention from activists"), the City of Houston "agreed to disburse $90,000 in federal grant money for a day labor center east of downtown." Federal taxpayers should not be footing the bill for illegal aliens to find work on U.S. soil...

Obviously, the Bush administration thinks differently.