...Working on the meatpacking floor can be a grueling, monotonous, dangerous routine, making thousands of the same cuts or swipes every day, and annual injury and illness rates might run 25 percent or more, but a union job with a wage of $12-$13 an hour, enough to support a family, seems worth the pain and risk. At least until December 12, the holiday celebrating the appearance of the Virgin of Guadalupe. What materialized in front of the Swift gates that morning was more like a vision of hell. Shortly after 7 am a half-dozen buses rolled up with a small...