For years, volunteers have left food and water in remote stretches of desert along the U.S.-Mexico border. They say they're trying to save the lives of migrants making the dangerous crossing. But the government argues these volunteers are encouraging illegal immigration.
Now several volunteers face jail time when they're sentenced on Friday.
"What we've seen in the last two years is a real escalation," said Catherine Gaffney, a spokeswoman for the activist group No More Deaths.