Hard Rock was a prisoner known for his badassery. His prisonmates looked up to him, because of the things he did and how he presented himself. He caused a lot of problems in the prison and the officers wanted to change that.
The prison took it amongst themselves to send Hard Rock to a surgeon for a lobotomy, so that he would be more calm and less problems would occur at the prison.
The other prisoners did not believe that their Hard Rock was calmer, so they had a country prisoner insult Hard Rock, which didn't have an effect on him at all. The prisoners began to felt lost without their leader.
The central idea is that even in today's society, race is still a determining factor on how badly a prisoner is punished.
A poetic device used in this poem was the speaker, the way they spoke allowed the reader to be more involved in the reading, as if he or she were actually there.
The theory shown in this poem is historical critism, the author relates to Hard Rock's treatment to a similar scenarios that slaves went through in the 1800s.