U.S. Constitution http://www.usconstitution.net/const.html
Declaration of Independence http://www.ushistory.org/declaration/document/
US Code of Federal Regulations http://www.gpo.gov/fdsys/browse/collectionCfr.action?collectionCode=CFR
US Attorney General http://www.justice.gov/ag
US Government http://www.usa.gov
Find any US Government agency here: http://www.usa.gov/directory/federal/index.shtml