An anonymous reader writes: Former NSA whistleblowers contend that the agency shut down a program that could have "absolutely prevented" some of the worst terror attacks in memory. According to the ZDNet story: "Weeks prior to the September 11 terrorist attacks, a test-bed program dubbed ThinThread was shut down in favor of a more expensive, privacy-invasive program that too would see its eventual demise some three years later -- not before wasting billions of Americans' tax dollars. Four whistleblowers, including a congressional senior staffer, came out against the intelligence community they had served, after ThinThread. designed to modernize the agency's intelligence gathering effort, was cancelled. Speaking at the premier of a new documentary film A Good American in New York, which chronicles the rise and demise of the program, the whistleblowers spoke in support of the program, led by former NSA technical director William Binney."