This all happened back in 1982-1984. I don't think you're going to find a lot of living camp guards in the US work force today.
The craziest detail about this story is that, in the early 1980s, there was an organized effort to pressure the White House and pass legislation to make it impossible to deport Nazis. The effort was led by a group of Baltic and Eastern European ethnic affinity groups, largely out of Chicago. They were called "Americans For Due Process", and their ambition was to pass legislation requiring something like an international Nuremberg Tribunal process in order to anyone deported.
Reinhold Kulle, the specific Nazi in Soffer's story, was not a sympathetic case. He volunteered for the SS Totenkopf, guarded Gross-Rosen, assisted its evacuation to Mauthausen, lied about it when immigrating to the US, lied about the camp (claiming its victims were never beaten, shot, or killed) to investigators and in court, and ultimately confessed to those lies before being deported to West Germany, where he lived out his days (still collecting an OPRF pension!) as a free man.
Other cases were more complicated. One person was almost deported before evidence was discovered conclusively showing he had been confined to a work camp for the duration of the war. Two others were deported to Soviet controlled countries where they had been sentenced to death in absentia.