Blanche is called "mad" and is institutionalized in Streetcar. Elaborate on the issue of madness in this play employing Foucauldian perspective?

Like everything with Foucault, there are many different
approaches in answering this question.  The first would be the notion of division and
exclusion in society.  Blanche is declared "mad," in large part, because she is
different.  As Williams would write in another play, "too rare to be normal."  Her
institutionalization is because she is "different."  Stanley angles for Blanche to be
institutionalized through her sister in order to consolidate his own power and not be
threatened with Blanche and the formidable hold she had on her sister.  In using mental
illness as a reason to commit her, one sees the Foucaudian idea of being able to
manipulate mental illness as a way to foster division between society and the
individual.  Like  the genealogy offered in Foucault's work where there is a strict
division of those who are "accepted" and those who are rejected, the idea of the insane
person as being isolated as a way to consolidate the prevailing social order's
conception of power is one that is replicated with Blanche's own
institutionalization.