Yikes!  Looks like drug smugglers have discovered link analysis....

>                         According to former and current DEA, military, and State Department
>                         officials, the cartel had assembled a database that contained both the
>                         office and residential telephone numbers of U.S. diplomats and agents
>                         based in Colombia, along with the entire call log for the phone company
>                         in Cali, which was leaked by employees of the utility. The mainframe
>                         was loaded with custom-written data-mining software. It
>                         cross-referenced the Cali phone exchange's traffic with the phone
>                         numbers of American personnel and Colombian intelligence and law
>                         enforcement officials. The computer was essentially conducting a
>                         perpetual internal mole-hunt of the cartel's organizational chart. "They
>                         could correlate phone numbers, personalities, locations -- any way you
>                         want to cut it," says the former director of a law enforcement agency.
>                         "Santacruz could see if any of his lieutenants were spilling the beans."
>
>                         They were. A top Colombian narcotics security adviser says the system
>                         fingered at least a dozen informants -- and that they were swiftly
>                         assassinated by the cartel. A high-level DEA official would go only this
>                         far: "It is very reasonable to assume that people were killed as a result
>                         of this capability. Potential sources of information were compromised by
>                         the system."


Full article in Business 2.0:  http://www.business2.com/articles/mag/0,1640,41206,FF.html