and not by local managers. Walmart quickly held talks with the workers, addressing their concerns. Walmart asserts that its policy permits associates to air grievances without fear of retaliation. A 2004 report by Democratic United States Representative George Miller alleged that in ten percent of Walmart's stores, nighttime employees were locked inside, holding them prisoner. There has been some concern that Walmart's policy of locking its nighttime employees in the building has been implicated in a longer response time to dealing with various employee emergencies, or weather conditions such as hurricanes in Florida. Walmart said this policy was to protect the workers and the store's contents in high-crime areas and acknowledges that some employees were inconvenienced in some instances for up to an hour as they had trouble locating a manager with the key. However, fire officials confirm that at no time were fire exits locked or employees blocked from escape. Walmart has advised all stores to ensure the door keys are available on site at all times. In January 2004, The New York Times reported on an internal Walmart audit, conducted in July 2000, which examined one week's time-clock records for roughly 25,000 employees. According to the Times, the audit, "pointed to extensive violations of child-labor laws and state regulations requiring time for breaks and meals", including 1,371 instances of minors working too late, during school hours, or for too many hours in a day. There were 60,767 missed breaks and 15,705 lost meal times. Walmart's vice president for communications responded that company auditors had determined that the methodology used by The New York Times was flawed, and the company "did not respond to it in any way internally." Walmart has been accused of allowing undocumented workers to work in its stores. In one case, federal investigators say Walmart executives knew that contractors were using undocumented workers as they had been helping the federal government with an investigation for the previous three years. Some critics said that Walmart directly hired undocumented workers, while Walmart says they were employed by contractors who won bids to work for Walmart. On October 23, 2003, federal agents raided 61 Walmart stores in 21 United States states in a crackdown known as "Operation Rollback", resulting in the arrests of 250 nightshift janitors who were undocumented. Following the arrests, a grand jury convened to consider charging Walmart executives with labor racketeering crimes for knowingly allowing