Lies may be perpetuated by an inability or unwillingness to communicate truths. Language then becomes a means of manipulating others, of making a show of following social codes, and of getting what one wants. When characters try to communicate or connect with another, language breaks down and they almost cannot speak.
Language is a tool of power in Cat on a Hot Tin Roof.
By omitting the voices and words of the African-American characters in the play, Tennessee Williams leaves a noticeably gaping hole that would otherwise comment on the Old South.