This resource—developed by Robert Wasserman in collaboration with the Office of Community Oriented Policing Services (COPS), DOJ, and DHS—focuses on developing relationships of trust among law enforcement, fusion centers, and the communities they serve, particularly immigrant and minority communities, so that the challenges of crime control and prevention of terrorism can be addressed. Trust, transparency, and the protection of privacy, civil rights, and civil liberties are fundamental to effective crime control, and these principles must serve as the foundation for information and intelligence sharing efforts intended to support crime prevention and terrorism prevention activities. Through a series of facilitated sessions, the Building Communities of Trust (BCOT) effort convened privacy, civil rights, and civil liberties groups; community leaders; and law enforcement officials for an intensive dialogue. The program’s objective is to help communities understand how law enforcement is using information to protect neighborhoods and citizens, while at the same time educating law enforcement on the priorities and needs of residents and how various community members view law enforcement efforts. The resulting guidance provides advice and recommendations on how to initiate and sustain trusting relationships that support meaningful sharing of information, responsiveness to community concerns and priorities, and the reporting of suspicious activities. Building and maintaining trusting relationships between communities and law enforcement to prevent acts of crime and terrorism is the overarching theme of this document.