A rally in Beacon marked a decade since an inmate's death at Fishkill Correctional Facility, with loved ones demanding better prisoner treatment.
Samuel Harrell died from injuries at the prison in 2015.
Organizers claim up to 20 correction officers killed Harrell.
The U.S. attorney and Dutchess County district attorney dropped the criminal investigation, citing insufficient evidence.
Protesters called for sentencing reforms and legislation to simplify firing abusive correction officers.