I recently quit a call center position, only to learn that my friends in the same team were let go the next week as well as many many other employees. Three weeks later, I received a call from HR informing me that I need to return back to the company site with legal documents to prove who I am. They refused to answer my inquiries as to why and said they have limited information to share and this is for Homeland Security reasons. I can't find any information about this online or from family and friends so I am a little worried. Please any ideas as to what I should do, I would be very grateful.