Software Suite for Identifying Suspicious Individuals

It can be very useful to know about activities among individuals; for example, which individuals are associated with other individuals? When two or more individuals get together, is there an intended purpose? Who are the leaders or important individuals of a group? What is the organizational structure of the group? It can prove useful to have the capability to actually model the above types of interactions and associations. To an extent, this type of social research has been addressed by employing the disciplines of data mining and community generation.