The only organizations that would indicate that a person may be considered for the list would be recognized terrorist organizations. Al-Qaeda is a perfect example. A person is a known member of al-Qaeda, has experience in bomb-making, perhaps, and actually attempted to blow up an airliner ten years ago--this is all hypothetical. That may be a good candidate for someone to put on a specified persons list.
On April 29th, 2010. See this statement in context.