Many years ago I thought this was a real documentary, but it is really a critique of the arrogance of documentary form, the hubris of religion, and a slap in the face of Fascist Spain. 'Nanook' is about "the nobility of man", this is his ignobility. Listen to the language. Everything is degraded to the point that it is laughable. Originally, it was narrated live like a slide show. Bunuel the 'voice of god'. Imagine!
Even disguised as a documentary, Buñuel's influence is clearly discernible. The jabs at religion and the government are no strangers to Buñuel's films. Everything (music, narration, mood, and even subject matter) is presented in the most serious way one can a documentary, and yet becomes absurd often without losing any of the solemnity.
Es un reclamo a los pueblos en miseria por unificarse y vencer los poderes de los gobiernos represores. En este caso una critica al fascismo que hace eco en la actualidad con los prósperos gobiernos que tienen gente en la miseria, esta clase de miseria que Buñuel muestra tan sórdida.