This monograph examines the development of the substantive and procedural law regulating union discipline of members. Chapter 1 presents a brief introduction and describes the organization of the rest of the booklet. Chapter 2 discusses the state courts' intervention into union disciplinary proceedings and then examines the substantive rules that such courts have developed. Chapter 3 traces the development, rationale, and present status of the federal substantive law. Chapter 4 analyzes the federal procedural law and its limits. Chapter 5 explores the current role of the state courts in light of federal regulation, and chapter 6 presents the author's conclusions and recommendations. (Author)