In the 1830s, as Britain navigated political reform to stave off instability and social unrest, Ireland became increasingly influential in determining British politics. This book is the first to chart the importance that Irish agrarian violence known as 'outrages' played in shaping how the 'decade of reform' unfolded. It argues that while Whig politicians attempted to incorporate Ireland fully into the political union to address longstanding grievances, Conservative politicians and media outlets focused on Irish outrages to stymie political change. Jay R. Roszman brings to light the ways that a wing of the Conservative party, including many Anglo-Irish, put Irish violence into a wider imperial framework, stressing how outrages threatened the Union and with it the wider empire. Using underutilised sources, the book also reassesses how Irish people interpreted 'everyday' agrarian violence in pre-Famine society, suggesting that many people perpetuated outrages to assert popularly conceived notions of justice against the imposition of British sovereignty.