WASHINGTON — The secrecy surrounding the National Security Agency’s post-9/11 warrantless surveillance and bulk data collection program hampered its effectiveness, and many members of the intelligence community later struggled to identify any specific terrorist attacks it thwarted, a newly declassified document shows.
The document is a lengthy report on a once secret N.S.A. program code-named Stellarwind. The report was a joint project in 2009 by inspectors general for five intelligence and law enforcement agencies, and it was withheld from the public at the time, although a short, unclassified version was made public. The government released a redacted version of the full report to The New York Times on Friday evening in response to a Freedom of Information Act lawsuit.