Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Condemned by police and legal authorities while often prised by community members, vigilante groups are still present even in modern democratic countries. Rooted in medieval vendetta, vigilantism has grown and developed through the history and adapted to modern times and crimes, and even has spread to the internet. Learn more about old and new outlaw groups that enforce justice by reading this book.