Gang violence is one reason why so many unaccompanied minors say they’re fleeing their home countries and crossing the Mexican border into the US. But Leslie Vélez of the UNHCR says when we think of those gangs, we shouldn’t envision something as tame as the Bloods and Crips.Gang violence is one reason why so many unaccompanied minors say they’re fleeing their home countries and crossing the Mexican border into the US. But Leslie Vélez of the UNHCR says when we think of those gangs, we shouldn’t envision something as tame as the Bloods and Crips.