The last known ringleader in a case of human smuggling that began unraveling at a Grand Forks restaurant and turned into one of the biggest human trafficking cases in the nation's history was sentenced to prison in federal court this week in Fargo. It ends a key phase of the case - involving 6,000 illegal immigrant workers slaving in Asian restaurants across the Midwest - but more cases against more restaurant owners might be built, said Assistant U.S. Attorney Nick Chase, who prosecuted the case. "This whole case started with two Mexican guys who walked away from the restaurant in...