if you click on the circles you get who that person is emailing to..
For all three networks, nodes (a.k.a. circles) are people and links (a.k.a. lines) between nodes indicate that two people were on a common e-mail thread. The size of a node shows the number of e-mail threads in which a person participated. The size of a link denotes the number of shared e-mail threads between two people. Each node is algorithmically assigned to a community (a group with a disproportionately large number of links among them), which is shown by node color.
and the sidebar has a list of the emails.
then all you have to do is google their name and find articles on who they are and what they have been doing.
now, if someone would only do a similar graphic on the tentacles of the Trump outfit.