When you find a book or article you think might be useful for your research, click on some of the subject headings associated with it. These may bring you to additional related resources. Here are some Library of Congress Subject Headings to get started with:
Anti-racism -- United States
Black lives matter movement
Correctional law -- United States
Criminal justice, administration of -- United States
Discrimination in criminal justice administration -- United States
Discrimination in law enforcement -- United States
Imprisonment -- United States
Imprisonment -- Social Aspects -- United States
Juvenile delinquents -- legal status, laws, etc.
Law Reform -- United States
Police brutality -- United States
Punishment -- United States
Prisons -- Law and Legislation -- United States
Racism in criminal justice administration -- United States
School discipline -- Law and legislation -- United States
School Discipline -- Law and Legislation