During the 1980s, addiction to crack cocaine escalated at an alarming rate. As the demand for crack grew, so did the economic opportunities for entrepreneurial street dealers, who developed criminal underground networks for the supply and retail sale of the high-profit substance. While crack cocaine use has since plateaued and is on the decline, hard-core dealers persist in selling the increasingly unprofitable drug in a high-risk, competitive street market.

Bruce A. Jacobs bases his study on dangerous field research conducted in one of the most socially distressed and impoverished...