Criminal Justice Statistics

Bureau of Justice Statistics - there's some great stats here in excel files you can download:

https://www.bjs.gov/index.cfm?ty=pbdetail&iid=2056

Sentencing Project:

https://www.sentencingproject.org/

Demographics of long prison terms:

http://apps.urban.org/features/long-prison-terms/demographics.html

Equal Justice Initiative and excessive punishments:

https://www.eji.org/mass-incarceration/excessive-punishment

The Marshall Project:

https://www.themarshallproject.org/