The Minutemen could be heard before they were seen. First came the bullhorns barking "This is America, not Mexico" and "No work today. The Minutemen have arrived." Then the group of two dozen men and women, holding U.S. flags and cameras in their hands, turned the corner and started bearing down on Hispanic workers waiting for jobs outside the Macehualli day-labor center in northern Phoenix, Ariz. Sensing trouble, some took refuge behind the gates of the center, and others melted away down side streets. As the laborers fled, the protesters tried to take pictures of their faces. "This is our country!" shouted a Minuteman. "We are under invasion."