Metropolis (1927)

This classic film about class struggle pulled out all the stops to generate a bleak, futuristic world where the masses were simply cogs in the wheel of progress (or at least labourers in an unfriendly factory). There are plenty of dials and steam in this analog future and not many smiles. Director Fritz Lang incorporates plenty of grouped choreographed movement and solo modern dances to demonstrate visually the moral of the film:

"The head and hand need a mediator, and that mediator is the heart!"

At the heart of the film is class struggle and considering that the film was made during the interwar period in Germany, I think it captures much of the sentiment of the Weimar Republic.

IMDB