This book provides a unique analysis of prisons and the violence at work inside them. It not only addresses aspects such as racial discrimination, especially in US prisons, but also gender differences, specific criminal groups operating within prisons, the reintegration processes and its failures. Combining works by various authors, it presents diverse perspectives on prison violence: in countries ranging from the USA to Australia, crossing European countries such as Portugal and Spain, among others, but also specific aspects such as prohibitions on phone calls, the economic crisis, and the current challenges of mass incarceration. As such, it offers a broad overview of several problems relevant to all scholars interested in deepening their understanding of violence in prisons.