Review of the Federal Bureau of Investigation's Activities Under Section 702 of the Foreign Intelligence Surveillance Act Amendments Act of 2008, September 2012, Re-released with Some Previously Redacted Information Unredacted [open pdf - 6MB]
"The Foreign Intelligence Surveillance Act of 1978 Amendments Act of 2008 (FAA) was signed into law on July 10, 2008. [...] The FAA followed earlier efforts to enhance the nation's ability to gather signals intelligence in the wake of the terrorist attacks of September 11, 2001. In October 2001, the President authorized a highly classified program, known as the President's Surveillance Program, to conduct electronic surveillance of certain communications into and out of the United States without seeking orders from the Foreign Intelligence Surveillance Court (FISA Court).
Department of Justice, Office of the Inspector General: http://www.oig.justice.gov/