Congressional Research Service Report (CRS Report) that provides an overview of the three main systems that data on crime is collected through Uniform Crime reports, the National Incident Based Crime Reporting System, and the National Crime Victimization Survey. The report also provides an historical background, method of data collection, and strengths and weaknesses.
"A national non-profit organization serving the media and the public with analysis and information on issues concerning capital punishment." Includes information about executions in the U.S. since 1976.
"Collects data from a nationally representative sample of local jails on jail inmate populations, jail capacity, and related information. The collection began in 1982 and has been conducted annually, except for years 1983, 1988, 1993, 1999, and 2005, during which a complete census of U.S. local jails was conducted."