IN the past 15 months, at the request of President Obama, Mexico has carried out a ferocious crackdown on refugees fleeing violence in Central America. The United States has given Mexico tens of millions of dollars for the fiscal year that ended Sept. 30 to stop these migrants from reaching the United States border to claim asylum.

Essentially the United States has outsourced a refugee problem to Mexico that is similar to the refugee crisis now roiling Europe.

“The U.S. government is sponsoring the hunting of migrants in Mexico to prevent them from reaching the U.S.,” says Christopher Galeano, who spent last summer researching what’s happening in Mexico for human rights groups there. “It is forcing them to go back to El Salvador, Honduras, to their deaths.”

I went to Mexico last month to see the effects of the crackdown against migrants, who are being hunted down on a scale never seen before and sent back to countries where gangs and drug traffickers have taken control of whole sections of territory. More than a decade ago, I rode on top of seven freight trains up the length of Mexico with child migrants to chronicle hellish experiences at the hands of gangs, bandits and corrupt cops who preyed on youngsters as they journeyed north. Compared with today, that trip was child’s play.