Before the headline changed, it was asking if the NSA could "blacklist" people without telling them what. Given the context of no-fly lists, you can see what t

Before the headline changed, it was asking if the NSA could "blacklist" people without telling them what. Given the context of no-fly lists, you can see what that's about. But without that context, you are wondering just what in the world it means. Are those people not allowed to be Americans?