Justice Department and NSA memos proposing broader powers for NSA to collect data.
Memo to attorney general Michael Mukasey in 2007 requesting permission for the NSA to expand its 'contact chains' deeper into Americans' email records.
Source:
http://www.sendspace.com/file/68zn0l

NSA inspector general report on email and internet data collection under Stellar Wind.
Source:
http://www.sendspace.com/file/fkdxtb