Instant karma: the Peace Corps were ordered to leave Bolivia two years after the movie was released.
It could be the subject of a horror movie if it were not based on historical facts:a humanitarian organization sterilizes Indian women from Bolivia unbeknown to them.Shot in black and white,with a shoestring budget ,the movie retains enough strength to grab-and to make their mind revolt-today's audience.
A precise depiction of the way of life of these people who are still living in autocracy (see the scene when the woman refuses to sell all her eggs to the "doctors")and whose civilization is still based on their religious beliefs which they use to understand the mysterious things which happen to their wives (the coca leaves).
It's also a -reasonably justified-plea for a square deal for the underprivileged :the man's run ,searching desperately blood for his brother who can't have an operation .The short sequence in which the poor lad sees the rich people playing tennis or swimming in the pool shows what Bunuel would call "Le Charme (not so) Discret De La Bourgeoisie".