Final answer:
Etheridge Knight wrote the poem "Hard Rock Returns to Prison from the Hospital for the Criminal Insane." The poem delves into experiences within the prison system.
Step-by-step explanation:
The poem "Hard Rock Returns to Prison from the Hospital for the Criminal Insane" was written by Etheridge Knight. This work reflects the life and experiences within the prison system, specifically focusing on a legendary inmate named Hard Rock. Knight is known for his poignant and powerful poetry that often explores themes of African American culture, personal experiences, and the justice system.