enough, is called "traitors." it names and shames individuals who are supposedly enemies of the russian state. lugovoi's high profile here is just one reason that many people who suspect him of murder don't think he acted on his own. another reason, all of the polonium 210 in russia is under the control of the state. >> it's impossible to use a state-controlled substance like this without the knowledge of the very top of the country. >> reporter: because you're unleashing a radioactive substance? it's almost -- it's a tiny, little dirty bomb. >> it's nuclear terrorism. coming up. where does this trail really lead? of all his enemies. he may have infuriated one more than any other. >> i said that this was a very dangerous thing to do because you're personalizing this. what about him?