Thomas Drake served as a senior executive at the NSA from 2001 to 2008. He brought his concerns about wasteful spending at the NSA and the government's surveillance program to a Baltimore Sun ...

Edward Loomis worked as an NSA cryptologist from 1964 to 2001. Prior to the 9/11 attacks, Loomis unsuccessfully lobbied the agency to adopt a sophisticated data-collection program -- nicknamed ...

Ben Rhodes is President Obama's deputy national security adviser for strategic communications and speechwriting. Here, he discusses the president's review of "the program" and the White House reaction ...

J. Kirk Wiebe worked as a senior analyst at the NSA from 1975 to 2001. In the aftermath of 9/11, he was among a handful of NSA employees who stumbled upon a secret program at the agency to monitor the ...

Former Department of Justice attorney Thomas Tamm uncovered evidence of the government's secret electronic surveillance of U.S. citizens, a discovery he later leaked to The New York Times.

Diane Roark served as a top staff member on the House Intelligence Committee from 1985 to 2002. She fought to end the NSA's post-9/11 warrantless wiretapping initiative, telling FRONTLINE she ...

A retired U.S. Air Force general, Michael Hayden served as director of the CIA from 2006 to 2008 and the director of the NSA from 1999 to 2005. As head of the NSA under President George W. Bush, ...

Alberto Gonzales served as U.S. Attorney General from 2005 to 2007. Prior to joining the Justice Department, he was White House Counsel to President George W. Bush. As the president's top legal aide, ...

Glenn Greenwald is a journalist, lawyer and columnist who broke the story of widespread NSA surveillance while working for The Guardian U.S. His stories, based on documents provided to him by former ...

Reporter Barton Gellman broke the story of the NSA's work to mine the communications data of millions of Americans by tapping directly into the central servers of U.S. Internet companies. His story, ...

Andrew Card served as chief of staff to President George W. Bush from 2001-2006. As a top advisor to the president, Card played a central role in developing the administration's post-9/11 intelligence ...

William Binney is a 36-year veteran of the NSA. He resigned from the agency and became a whistleblower after discovering that elements of a data-monitoring program he had helped develop -- nicknamed ...

The agency gets access to an estimated 15-20 AT&T sites across the U.S., data mining phone and Internet communications to find potential terrorists.

John O. Brennan, a 29-year veteran of the CIA and a key advisor to the president, had previously been considered by Obama for CIA director in 2008, but his nomination was thwarted after criticism of ...

In this excerpt from the 2003 FRONTLINE documentary "Truth, War & Consequences," correspondent Martin Smith asks Ahmad Chalabi about the intelligence that led to the U.S. invasion of Iraq.

In this excerpt from the 2003 FRONTLINE documentary "Truth, War & Consequences," correspondent Martin Smith asks Ahmad Chalabi about the intelligence that led to the U.S. invasion of Iraq.

Footage of "The Man Who Knew" talking about the work of FBI agents, how he handles the emotional challenges of his job, and "ordered liberty" -- the delicate balancing of national security and civil ...

With his Contract With America, the center of domestic political power shifts to Newt's agenda. His House of Representatives passes nine of the contract's 10 commandments in its first 100 days. But ...

Newt seizes control of GOPAC, the Republican political action committee, and makes it an instrument for his conservative political vision. Piercing political language is his greatest weapon and GOPAC ...

In his first congressional campaign Newt runs as a liberal Republican reformer, endorsed by environmentalists. Negative ads by his opponent pierce Newt's thin skin, but by his third campaign he sheds ...

Newt arrives in Congress with two dreams: becoming speaker of the House and building a Republican majority. He learns controversy is a way to attract attention and he seizes on new media, like C-Span, ...