Earlier this month, federal prosecutors in Arizona brought criminal charges against a local activist who devotes his free time to helping migrants survive the deadly desert route northward. Scott Daniel Warren, prosecutors allege in a complaint accusing him of violating a federal law against harboring migrants, provided two people with “food, water, beds, and clean clothes” for three days. Attorney General Jeff Sessions has been a vocal proponent of deploying the Justice Department’s extensive resources against migrants. In a April 2017, he urged prosecutors to ramp up criminal charges for [...]