The DOJ Web site (www.usdoj.gov) posts the U.S. Attorney's Manual, briefs, advisory letters, regulations, reports, and much more. Especially useful are the pages for the individual Divisions. You can link to these pages from the DOJ Organizational Chart.
Government Attic archives DOJ documents obtained with FOIA requests.
Reported Opinions of the Office of Legal Counsel ("Op. Off. Legal Counsel") are searchable on Lexis (GENFED;USAG) and Westlaw (USAG) from 1977 (Volume 1) to present, and on Hein Online from 1977 to 2002.
Antitrust: The Antitrust Division enforces and explains U.S. atitrus laws. The Division posts selected case filings (1994-present), appellate briefs, Business Review Letters, etc.
In addition, the CCH Trade Regulation Reporter publishes certain Antitrust Division materials, including consent orders and summaries of "complaints, indictments and developments."
For additional materials, call the Antitrust Division's Document Group (202-514-2481).
Immigration and Naturalization Service: The INS was a division of the DOJ that handled immigration. The INS was replaced by U.S. Citizenship and Immigration Services (USCIS), a bureau of the Department of Homeland Security on March 1, 2003 (per the The Homeland Security Act of 2002, P.L. 107â?"296, 116 Stat. 2135). See the Immigration entry for more information.