The American Antitrust Institute is an independent non-profit organization based in Washington D.C. with a mission to increase the role of competition, assure that competition works in the interests of consumers, and challenge abuses of concentrated economic power in the American and world economy. Their Web site includes links to working papers, amicus briefs, and testimony.
This PDF guide to antitrust law, created by Public Knowledge Competition Policy Counsel Charlotte Slaiman, provides a basic foundation in antitrust law. The goal of this primer is to help advocates and consumers educate themselves about antitrust law and to explain how they can best help to hold companies accountable for anticompetitive behavior.
The Federal Trade Commission's Bureau of Competition enforces the nation's antitrust laws. The Bureau of Competition investigates potential law violations and seeks legal remedies in federal court or before the FTC's administrative law judges. The Bureau also serves as a resource for policy makers on competition issues.
The Antitrust Division enforces antitrust laws (in both civil and criminal actions) and helps provide guidance to the business community on antitrust laws. Their Web sites "Public Documents" section includes links to articles and papers, statutes, administrative guidelines, appellate briefs, and more.