"The UCR Program's primary objective is to generate reliable information for use in law enforcement administration, operation, and management; over the years, however, the data have become one of the country’s leading social indicators." (Description from website.)
NIJ conducts research on behalf of the U.S. Department of Justice. You can search the site, or click "Topics" on the homepage to select your research area.
"The purpose of TRAC is to provide the American people — and institutions of oversight such as Congress, news organizations, public interest groups, businesses, scholars and lawyers — with comprehensive information about staffing, spending, and enforcement activities of the federal government." (Description from website.)
The National Institute of Corrections monitors issues and challenges in modern correctional work. You can browse a list of correctional topics under the "Projects" tab.