Every year, over a million illegal immigrants try to cross the US/Mexican border. Hundreds die in the attempt. "People migrate because of sheer economic desperation," explains public defender Isabel Garcia. "It's not something that they take lightly." But the minutemen of Arizona have no sympathy. "We have out of control immigration," states Chris Simcox, co-founder of the group. He organises patrols of volunteers to hunt down migrants. The minutemen have proved so successful, they're planning to expand to other counties. But with the US economy dependent on illegal labour, the government is unlikely to heed their call to stop all immigration.