The LoneStar Project was initiated in the fall of 2014 with several ambitious goals. Key among those goals was the successful completion of interviews with gang and non-gang members. By the spring of 2018, the research team had completed two different types of interviews: the first included interviews with 802 inmates in two Texas prisons and the second included two post-release interviews conducted within the first year upon returning to the community. This book is the product of those interviews, official records for each individual, and the subsequent analysis and interpretation of those data. The primary focus of our work has been to produce a comparison of the culture, structures, processes, and behaviors of gang and non-gang members in prison and their roles in controlling prison life. Our approach was mainly quantitative and comparative, although qualitative accounts of these foci are important to this book.