NSA's Domestic Spying Grows As Agency Sweeps Up Data - WSJ.com

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According to current and former intelligence officials, the spy agency now monitors huge volumes of records of domestic emails and Internet searches as well as bank transfers, credit-card transactions, travel and telephone records. The NSA receives this so-called "transactional" data from other agencies or private companies, and its sophisticated software programs analyze the various transactions for suspicious patterns. Then they spit out leads to be explored by counterterrorism programs across the U.S. government, such as the NSA's own Terrorist Surveillance Program, formed to intercept phone calls and emails between the U.S. and overseas without a judge's approval when a link to al Qaeda is suspected.

The NSA's enterprise involves a cluster of powerful intelligence-gathering programs, all of which sparked civil-liberties complaints when they came to light. They include a Federal Bureau of Investigation program to track telecommunications data once known as Carnivore, now called the Digital Collection System, and a U.S. arrangement with the world's main international banking clearinghouse to track money movements.

NSA's Domestic Spying Grows As Agency Sweeps Up Data - WSJ.com