This book is the first ever collection of scholarly essays on the history of the Irish working class. It provides a comprehensive introduction to the involvement of Irish workers in political life and movements between 1830 and 1945. Fourteen leading Irish and international historians and political scientists trace the politicization of Irish workers during a period of considerable social and political turmoil. The contributions include both surveys covering the entire period and case studies that provide new perspectives on crucial historical movements and moments. This volume is a milestone in Irish labour and political historiography and an important contribution to the international literature on politics and the working class.