“The Adelitas have arrived/To defend our oil/Whoever wants to give it to the foreigners/ Will get the shit kicked out of him!” yodelled the brigades of women pouring onto the esplanade of the Mexican senate. The demonstration was to protest a petroleum privatisation measure President Felipe Calderon insists is not a petroleum privatisation measure — and which he sent onto the Senate for fast-track ratification at the tag end of the session this April.