The methodology reconstructs these cases from previously classified investigative files. Observations derived from these cases include the sources of organizational intelligence, investigative methods, and encounters among anti-trust victims, offenders, and officials. Complainants and informants outside the agency are responsible for originating most cases. Most of the evidence comes from actual offenders, who usually receive immunity or leniency in exchange for their cooperation. The paper concludes that public exposure of trade conspiracies serves as a deterrent despite weak penalties. 11 notes, 2 tables, 59 references. (Author abstract modified)