When foreign workers began to come accross the border in large number, taking jobs from citizens, the federal goverment put the army on the border. They had orders to shot into large groups, to stop them or to get them to turn around.
When? Since 1999.
Don't remember it? Because it is the MEXICAN army on the border with Guatamala.
Its OK. There Mexican. Its all Bush's fault. What ever excuse you can make for them, they take and never give.
Can you send me an accurate source for this info?