Legislation that required the registration of firms’ anticompetitive agreements (cartel registers) to reveal, and sometimes regulate, anticompetitive behavior was relatively common in many nations before 1975. Examining the introduction of these registers in sixteen mostly OECD countries between 1920 and 2000 reveals which industries and sectors appeared to minimize successfully the impact of the legislation in their jurisdiction. We find considerable variation, but in most countries, the agriculture and export sectors were especially successful in avoiding or delaying the application of a register in their areas of interest.