Consider exploring topics at the National Criminal Justice Reference Service site. While this links to their A to Z index, another way of browsing topics is by category, as listed at the left on the linked page.
The National Institute of Justice also provides a list of topics for browsing.
Many of the federal offices and national organizations listed on the Reports and Statistics page of this guide also provide browsable lists of topics and issues.
Up-to-date reports on “hot” topic issues (like gun control and immigration). Definitions and chronologies are clear and easy to understand. Pro/con essays and statistics often are included with the reports.
Hundreds of topics. “Pro” and “Con” positions are presented. Descriptions, definitions, infographics of relevant statistics, news and histories cover all aspects of most topics. Citations provided.