Jean-Numa Ducange is Assistant Professor at Rouen-Normandie University, France. He is the co-director of the French journal Actuel Marx (PUF) and Austriaca (PURH), and one of the best scholars about the history of socialism (France, Germany, Austria).

Chapter One: "The Apostle of the Fourth Estate" (1845-1880)

Chapter Two: "The Genius of Simplification": Guesde, Founder of the First Socialist Party (1880-1893)

Chapter Three: "The Icy Frisson of the Irreconcilable": Guesde in Parliament (1893-1898)

Chapter Four: "Finally, We've Cut Ties": The Intransigent (1898-1905)

Chapter Six: "Without him, it's no longer the same thing": Guesde the Minister and Guardian of Unity (1914-22)

Chapter Seven: "Eternal Guesdism": The Prophet's Legacies