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