This has Marxist connotations because people in lower positions of power, status or wealth are the lower class, or even the proletariats in Marxist theory. Lee's use of metaphor enhances this ideal as the image of the mockingbird is visual and intense. Furthermore, Miss Maudie states that "The Mockingbirds don't do one thing but create music for our enjoyment", which can be related to Marxism through the character of Tom Robinson. Tom's behavior mimics mockingbirds "singing at the top of their lungs". The idiom Lee uses suggests vigor and intensity, which is how Tom behaves as he is excited to help Mayella for free - he says "there is no cost". This means Marxism since Tom has a low class status. From the metaphor and symbolism of the thrush we can therefore deduce that the novel is Marxist