On the last night of their lives, Jagdish Patel, his wife and their two young children tried to slip into the U.S. across a near-empty stretch of the Canadian border. Wind chills reached minus 36 Fahrenheit (minus 38 Celsius) that night in January 2022 as the family from India set out on foot to meet a waiting van. Coordinating things in Canada, federal prosecutors say, was Harshkumar Patel, an experienced smuggler nicknamed “Dirty Harry.”