NNSC Problem Analysis Fact Sheet
The two primary components of NNSC’s problem analysis includes the group audit and incident review. The group audit is a review of all active groups
Strategies for Change
“Social services cannot [reduce violence] alone. Community members cannot fight that battle alone…nor do I think police can. I think that we’ve got to work together.”
Reygan Harmon, Ceasefire Program
Director, Oakland Police Department
The Group Violence Intervention (GVI) reduces homicide and gun violence, minimizes harm to communities by replacing enforcement with deterrence, and fosters stronger relationships between law enforcement and the people they serve. National Network Executive Director David Kennedy and colleagues pioneered GVI’s evidence-based strategies with “Operation Ceasefire” in Boston during the 1990s. Subsequent GVI implementations across dozens of challenging cities, including Oakland, Chicago, Detroit, and New Orleans, have repeatedly demonstrated that violence can be dramatically reduced when community members join together with law enforcement and social service providers to focus a three-pronged antiviolence message on highly active street groups.
The GVI messages are simple: Community members with moral authority over group members deliver a credible moral message against violence. Law enforcement puts groups on prior notice about the consequences of further group-involved violence for the group as a whole. And support and outreach providers make a genuine offer of help for those who want it. A central method of communication is the call-in, a face-to-face meeting between group members and the strategy’s partners.
“I think the most important thing about the National Network and the focused deterrence strategy is that it’s a very powerful blend of a lot of the best of what we know about criminal justice today.”
Thomas Abt, Senior Research Fellow and Lecturer, Harvard University
When these three elements are in place, and partners across community, law enforcement, and support and outreach providers can work together, GVI fosters internal social pressure within groups that deters violence, elevates clear community standards against violence, offers group members an “honorable exit” from committing acts of violence, provides a supported path for those who want to change, and reserves strategic, group-based sanctions only for situations where group-involved serious violence persists.
Facts on the Ground
- Even in communities with high rates of violence, very few people are involved in homicides and shootings. They are connected to each other through groups.
- Group members typically make up around half a percent of a city’s population but are involved in as much as 70 percent of its homicide and gun violence.
- Young men in these communities face extraordinary homicide rates—about 100 times the national average.
- Those at the highest risk of shooting someone are often the same people who face the highest risk of becoming a shooting victim.
- Traditional approaches have over-policed communities of color while failing to protect them from violence, increasing mistrust.
Group members
What are groups?
The term “group” refers to any social network whose members commit violent crimes together. This can include anything from chapters of organized national gangs with recognized symbols (such as the Gangster Disciples) to loose neighborhood crews with no hierarchy or business (such as a set that claims a particular block). All “gangs,” “posses,” “sets,” “crews,” “blocs,” and other associations are names for groups.
Community Violence and Intimate Partner Violence Intersections White Paper
Two of the most devastating forms of violence affecting communities in the United States are community violence (CV) and intimate partner violence (IPV). Each year,
Support & Outreach White Paper
This white paper outlines a new “support and outreach” structure carefully tailored to the core street population, it's situation, and its needs.
Group Violence Intervention Issue Brief
Serious violence in the United States is concentrated in historically disadvantaged communities of color, and particularly among young men in those communities. The Group Violence
Custom Notifications: Individualized Communication in the Group Violence Intervention
This guide provides practical information about “custom notifications,” an independent element of GVI that enables quick, tactical, direct communication to particular group members. This publication presents the custom notifications process, explains its value within the broader strategy, details its use by several national practitioners, and encourages further development.
GVI: A Guide for Project Managers
This guide is a high-level overview of the role of the Project Manager in the Group Violence Intervention. It outlines the key operational components of a successful GVI implementation and provides strategic insights from current and previous GVI Project Managers.
Working with NNSC
Contact us to start a conversation about implementing the Group Violence Intervention in your community.
Results
Pontiac launches group violence intervention program to reduce gun violence
City staff and community partners begin training to address violence and juvenile involvement.
May 28, 2025
Training aims to curb gun violence in Pine Bluff
To tackle gun violence in Pine Bluff and Jefferson County, members of Group Violence Intervention are learning about call-ins with would-be offenders as a way
March 17, 2025
City of Roanoke sees progress in reducing violence
The city of Roanoke is making strides in its efforts to reduce violence, with significant progress reported in recent months. The city’s Group Violence Intervention
February 7, 2025
STRIVE webinar on Intimate Partner Violence Intervention
Through the Statewide Targeted Reductions in Intimate Partner Violence initiative (STRIVE), $35 million dollars will be invested to enhance safety and responses to victims. This
January 28, 2025
