The FBI: Have you or anyone you know ever had any contact with the FBI, whether that be the FBI interrogating you, reports sent to the FBI, or you having made a phone call to report someone or something to the FBI?
I made a couple of phone calls to the FBI after the terrorist attack on 9/11. Also to report suspicious activity in the neighborhood. They acted quickly in both cases. So if you see something or someone acting out of character, do something, let them know.