John Kelly teaches at the Department of Management, Birkbeck College, University of London. He has published widely on trade unions and the labour movement.

This is the definitive account of Trotskyism in the UK.

Introduction, Chapter 1 Theoretical Perspectives, Chapter 2 Trotsky and the Origins of Trotskyism, Chapter 3 Development of the Trotskyist Movement in Britain, Part 1: 1950-1985, Chapter 4 Development of the Trotskyist Movement in Britain, Part 2: 1985-2017, Chapter 5 Doctrine, Orthodoxy and Sectarianism, Chapter 6 Party Recruitment, Chapter 7 Party Electoral Performance, Chapter 8 Organizational Resources, Chapter 9 Working in the Trade Unions, Chapter 10 Social Movements and Front Organizations, Chapter 11 The Proliferation of Trotskyist Internationals, Chapter 12 The Achievements, Limitations and Weaknesses of Trotskyism, Appendix 1 British Trotskyist Organizations 1950-2017, Appendix 2 Sources for Trotskyist Organizational Membership Figures, Appendix 3 Trotskyist Organizations in Western Europe 2017, Appendix 4 Defunct Trotskyist Internationals 1970-2017, Appendix 5 List of Interviewees, Bibliography