The Freedom of Information Act: 5 U.S.C. 552
The Privacy Act of 1974: 5 U.S.C. 552a

/// REFERENCE INFO ///

DOJ FOIA Reference Page // This site includes:
— The massively useful FOIA Guide & Privacy Act Overview, published by DOJ yearly.
— Digest of FOIA-related litigation
— Numerous DOJ-level FOIA policy memos

/// AGENCY FOIA PAGES ///
(Great sources for agency-specific regulations…)

DoD FOIA Page
U.S. Air Force FOIA Page
USSOCOM FOIA Page
CIA FOIA Page
NSA FOIA Page