Immigration and Customs Enforcement officials said that early last month, agents reviewed more than 150 badge applications submitted by the company for 120 of its employees. In the affidavit, the agent reported that "110 of the applications listed Social Security numbers that either do not exist or belong to other persons, some of which were deceased."
ABC News called Ideal Staffing's Bensenville, Ill., office, but a voice mail message left for Gurin has not been returned.
"The fact that we didn't pick this up, says that our system is broken and it's absolutely terrifying that this kind of situation would go on," House Homeland Security Chairman Bennie Thompson, D-Miss., told ABC News.
If they are convicted, Gurin and Benitez could face a maximum penalty of 10 years in prison on the harboring charge, and five years for misusing Social Security numbers.
The workers arrested on state charges could face a maximum of three years in prison if found guilty.
Security officials said this case showed that despite all the billions spent securing airports since the Sept. 11 attacks, in some cases airports do not have a handle on who is working in sensitive areas or on some of the planes.
Concerned Homeland security officials told ABC News they are planning more investigations at airports across the country, worried that if such a breach could happen at O'Hare, it could happen anywhere.