so marty agrees to sell mysterious mike's smith & wesson revolver to the museum for >> what's unique about the gun is that the serial number has been scratched off. >> and you wouldn't expect it from a law-enforcement officer. >> no. but this is what the gangsters would do, and he was an undercover agent. >> marty also loans out mike's handcuffs, which he believes were used in the 1939 arrest of atlantic city mob boss nucky johnson, and several of his never-made-public case files. what does it mean to the museum to get these mike malone documents and artifacts from marty? >> the information that he has assembled is astonishing. so we're really proud to be able to show this in the museum. >> and marty's efforts to honor mike malone aren't done yet. >> i'm trying to get him the presidential medal of freedom, the highest civilian award that can be honored. >> and why do you think mike is deserving? >> my uncle put in 47 years of service to this country. but he did this with great risk to...