As you read this, keep in mind the concept of "six degrees of separation." On a global scale it may be closer to 42, but in the US 6 isn't all that far of.
The F.B.I. cast a much wider net in its terrorism investigations than it has previously acknowledged by relying on telecommunications companies to analyze phone-call patterns of the associates of Americans who had come under suspicion, according to newly obtained bureau records.
The documents indicate that the Federal Bureau of Investigation used secret demands for records to obtain data not only on individuals it saw as targets but also details on their “community of interest” — the network of people that the target was in contact with. The bureau stopped the practice early this year in part because of broader questions raised about its aggressive use of the records demands, which are known as national security letters, officials said.The community of interest data sought by the F.B.I. is central to a data-mining technique intelligence officials call link analysis. Since the attacks of Sept. 11, 2001, American counterterrorism officials have turned more frequently to the technique, using communications patterns and other data to identify suspects who may not have any other known links to extremists...
Typically, community of interest data might include an analysis of which people the targets called most frequently, how long they generally talked and at what times of day, sudden fluctuations in activity, geographic regions that were called, and other data, law enforcement and industry officials said.
The F.B.I. declined to say exactly what data had been turned over. It was limited to people and phone numbers “once removed” from the actual target of the national security letters, said a government official who spoke on condition of anonymity because of a continuing review by the Justice Department...
“This whole concept of tracking someone’s community of interest is not part of any established F.B.I. authority,” said Marcia Hofmann, a lawyer for the Electronic Frontier Foundation, which provided the records from its lawsuit to The New York Times. “It’s being defined by the F.B.I. And when it’s left up to the F.B.I. to decide what information is relevant to their investigations, they can vacuum up almost anything they want.”
...Officials at other American intelligence agencies, like the National Security Agency and the Central Intelligence Agency, have explored using link analysis to trace patterns of communications sometimes two, three or four people removed from the original targets, current and former intelligence officials said. But critics assert that the further the links are taken, the less valuable the information proves to be.
There are two near constants when it comes to power. One, it corrupts. Two, once granted, it will be both expanded and abused. These simple truth once were central to conservative thought.
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