professional law enforcement groups

The National District Attorneys Association
The National Association of Attorneys General
Interstate Commission for Adult Offender Supervision. Governing body for the transfer of probation and parole offenders between states.
Association of Government Attorneys in Capital Litigation

victims' groups

Crime Victims United of California
Crime Victims United of Oregon
Crime Victims United of Virginia
Justice For All
Crime Victims Action Alliance
Citizens Against Homicide

criminal law and justice information

State and National Crime Statistics
U.S. Department of Justice Bureau of Justice Statistics