https://www.fbi.gov/services/information-management/foipa/requesting-fbi-records
https://fas.org/irp/agency/doj/fbi/is/index.html
https://fas.org/irp/agency/doj/fbi/index.html
https://fas.org/irp/agency/doj/index.html
https://fas.org/irp/agency/doj/fbi/is/ncic.htm
https://www.fbi.gov/services/cjis/ncic
https://www.fbi.gov/wanted/seeking-information
https://www.fbi.gov/wanted/kidnap
http://www.doenetwork.org/ncic.php
https://vault.fbi.gov/fdps-1/@@search-fdps
unfortunately a lot of cases are deemed expired or their cases have been closed so accessing anything past 2007/2006 range is pretty damn fucking difficult without filing a direct request