This has been 'sanitized' of the preachy anti-capitalist boilerplate of the stage version and the movie hones it all down to very human tragedy of intense power. The backyard (which is the only set in the Broadway version) becomes central to the movie but the factory, prison, and other settings enrich the dialogue and plot. Lillian Hellman's play The Little Foxes was filmed stripped of its hard left preaching and it is a tremendous improvement. Robinson and Lancaster are magnificent.