What is the significance of Murder in the Cathedral as a play?

THere is a lot to this question and a thousand words is a bit much for this forum. I would say that the play is significant because it deals with individual opposition to authority. The play was written during a time of rising Fascism in Europe. Standing up to authority often meant severe punishment or death. Opposing regimes like the Nazis, especially their oppression of the Christian Church, is a major theme explored in this story.