If you search the Wash Posts site about the topic, there are several stories giving background on this...namely 2005/6 stuff.
http://www.washingtonpost.com/ac2/wp-dyn/NewsSearch?st=herndon+day+labor&fn=&sfn=&sa=sr&cp=&hl=false&sb=-3&sd=&ed=&blt=&sdt=&dpp=50
and this from wikipedia:
The town of Herndon was part of a nationally reported controversy involving illegal immigration beginning in 2005.[7] The controversy revolved around a day labor center called the Herndon Official Worker Center (HOW Center), constructed by the town and operated by Reston Interfaith's Project Hope and Harmony under a grant from surrounding Fairfax County.[8] The HOW Center was created in response to daily gatherings of Hispanic workers at a local 7-Eleven store[7] and resulting allegations of gang activity, public drunkenness, and public urination.[9] What had started as a local issue became national news when the Minuteman Project anti-illegal immigration group joined the local groups opposing the day laborers[10] and watchdog group Judicial Watch sued the town and county to block the center's construction.[11] The HOW Center opened in December 2005, on the site of the former Herndon Police headquarters.[12] The 2006 election for Mayor and Town Council revolved mainly around the issue, and resulted in unseating the pro-center Mayor and two councilmembers.[10] The center closed after less than two years of operation, in September 2007. The Town Council had demanded that any operator of the day-labor center check the laborers' identification, and a subsequent court decision required the town to open the center to all workers.[13] The Town Council chose instead to close the center entirely.[13][14]