Humans are a species that classifies. We arrange the flow of the things and events that we see and experience, place them into categories, and erect boundaries around those categories. Among the boundaries that we erect are those that we put around groups of "other" human beings. The evil side of human classification of other human beings is that we sometimes create false categories of other people, as is often the case in racial, ethnic, and religious stereotypes. This unmindful creation of empty categories of human characteristics is what happened during two periods crucial to the construction of race in America. This is racism. The United States is in a period of deep cultural flux and conflict, much of it seen through the lens of race. This book proposes that the everyday actions of ordinary people, in the context of extreme political and cultural polarization, distort the criminal justice system and betray the lofty ideals expressed in American founding documents and centuries of Anglo-American articulations of basic human rights. These everyday actions range across a spectrum from the armed intervention of private citizens in the forms of individual action, neighborhood watches, and citizen's arrests, to the expectations imposed on law enforcement, in particular, and the criminal justice system in general.

"Tom Diaz has worn out some shoe leather, much like a good detective, in gathering facts, not myths or urban legends. As a result he has produced an accurate and comprehensive look at a grave and present danger to our society."
--From the Foreword by Chris Swecker, former Assistant Director of the FBI and former head of the FBI's Criminal Investigation Division

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"No Boundaries" is a disturbing account of what many consider the "next Mafia"--Latino crime gangs. Like the Mafia, these gangs operate an international network, consider violence a routine matter, and defy U.S. law enforcement at every level. Also, the gangs spawn kingpins such as the notorious Nelson Varela Martinez Comandari, who nearly became the first "Latin godfather" in the United States.

Focusing on the Los Angeles-based Mara Salvatrucha (MS-13) and the 18th Street Gang, and the Chicago-based Latin Kings, Tom Diaz describes how neighborhood gangs evolved into extremely brutal, sophisticated criminal enterprises and how local and federal authorities have struggled to suppress them. As he makes clear, the problem of transnational Latino gangs involves complex national and international issues, such as racial tensions, immigration policy, conflict in Latin America, and world economic pressures.

Tragedy in Aurora is about the 2012 murder of budding sports journalist Jessica (Jessi) Redfield Ghawi in a public mass shooting, and the widening circle of pain it inflicted on her family, friends, police, medical first responders, and others. The book is at the same time a deep examination of the causes and potential cures of the quintessential 21st century American sickness-public mass shootings. At the heart of that examination is an unpacking of America's deep polarization and political gridlock. It addresses head on the question of why? Why is American gun violence so different from other countries? Why does nothing seem to change? The "Parkland kids" inspired hope of change. But the ultimate questions stubbornly remain-what should, what can, and what will Americans do to reduce gun violence? Tragedy in Aurora argues that the answer lies in a conscious cultural redefinition of American civic order. Over recent decades, America has defined a cultural "new normal" about guns and gun violence. Americans express formalistic dismay after every public mass shooting. But many accept gun violence as an inevitable, even necessary, and to some laudable part of what it means to be "American." Although Americans claim to be shocked with each new outrage, so far they have failed to coalesce around an effective way to reduce gun death and injury. The debate is bogged down in polarized and profoundly ideological political and cultural argument. Meanwhile, America continues to lead the globe in its pandemic levels of gun deaths and injuries. Combined with the cynical "learned helplessness" of its politicians, the result is gridlock and a growing roll of victims of carnage. Is there a path out of this cultural and political gridlock? Tragedy in Aurora argues that if America is to reduce gun violence it must expand the debate and confront the fundamental question of "who are we?" Tom Diaz gives a new understanding of American culture and the potential for change offered by the growing number and ongoing organization of victims and survivors of gun violence. Without conscious cultural change, the book argues, there is little prospect of effective laws or public policy to reduce gun violence in general and public mass shootings in particular.