This dynamic data analysis tool allows you to generate trend tables and figures of arrest data since 1980, including national arrest estimates and agency-level (police precinct) counts by offense, age, sex, and race. The underlying data are from the FBI's Uniform Crime Reporting (UCR) Program. 1980 - 2014
The Office of Research and Data collects data from documents submitted by the courts in each case in which a defendant is sentenced. From that data, the Commission prepares and disseminates public reports on a wide variety of sentencing issues.
The Gun Violence Archive is an online archive of gun violence incidents collected from over 2,000 media, law enforcement, government and commercial sources daily in an effort to provide near-real time data about the results of gun violence. GVA in an independent data collection and research group with no affiliation with any advocacy organization.
Data back to 2014.
See also: Tool from The Guardian which maps 2015 data down to the tract level.