The only character who exposes the reality of Belle Reve, showing the pretence of the Old South and its success (off the back of slavery) and how new american immigrants see through this guise
Her continual use of "Polack" to offend Stanley, and her eugenicist comments about mixing blood show she holds his background against him, especially in her zoomorphic descriptions of him
Marxist critics would see the ending as a triumph of the proletariat, and the mixing of classes (Williams took inspiration from Brecht, a Marxist)
Brecht used methods of theatre to present social aberrations to his audience so that they couldn’t be avoided. Here, Williams presents the social aberration of class.
Alice Griffiths: '"He insisted that setting, properties, music, sound, and visual effects—all the elements of staging—must combine to reflect and enhance the action, theme, characters, and language."'
Brecht, Chekhov, Hart Crane (quotes in the preface)
Brecht’s Lehrstucke, or morality plays for his communist ideas, seem to be reflected in SND. When Blanche encompasses all of humanity in her expression, Williams evokes Brecht’s works in asking the audience to draw parallels within their own lives.