The Marshall Project - a nonpartisan nonprofit that promotes criminal justice reform through journalism - asked every state prison system in the nation about their book policies and what books are banned. From the responses they received, they created an online database that contains the over 50,000 titles that are banned. If you have ever wondered what is not allowed for the incarcerated to read, this site is for you.
You can find the database on their site here (https://www.themarshallproject.org/2022/12/21/prison-banned-books-list-find-your-state)
You can search it by title or author and filter it by state. It also provides a list of why the titles are banned.
You can learn more about the Marshall Project here - https://www.themarshallproject.org/about?via=navright