National Institute of Justice (NIJ)
NIJ is the research, development and evaluation agency of the US Department of Justice. Since 1978, NIJ has been accumulating an archive of hundreds of data sets resulting from projects funded through research grant programs. NIJ partners with two other Office of Justice Programs agencies, the Bureau of Justice Statistics (BJS) and the Office of Juvenile Justice and Delinquency Prevention (OJJDP), to support the National Archive of Criminal Justice Data (NACJD). It is now hosted by ICPSR at the University of Michigan. You must CREATE AN ACCOUNT in order to access the data and descriptions. Note that there are almost 2,000 data sets that are already formatted for STATA, and an additional thousands more formatted for SPSS, SAS, R, and other programs. I would recommend exploring all the coverage they have through the index.