How have these things changed over the last several decades and why have they changed?

Look at Prison as a Social Institution and the history of prison as being a form of social control: (Watch 13th Documentary & Read Article Below) Please make sure you address the three different sociological perspectives when explaining. Make sure when explaining your answers you explain fully and elaborate your answers. I want to know that you understand the concepts underlying these issues, regarding social inequality, institutions, and race. PLEASE make sure you answer and explain thoroughly using the sociological perspectives. How have these things changed over the last several decades and why have they changed? Have they changed for the better or have they gotten worse? Does an institution such as prison have a role in modern day society? Does race or social class play a factor into any of this?