specially designated nationals
We are apparently prohibited from doing business with certain persons. There is a couple of unwieldy government links which reference the Executive Order Number 13224, and the list of suspected hoodlums (PDF Format). For a list which is actually usable with a search engine and disclaimers, I suggest the American Land Title Association site. I don't mind being prohibited from dealing with suspected international hooligans. It is good that someone has developed a way for us to check for these names so that it doesn't cost us more in staff time to research than the value of the intended transaction.