Three Guatemalan men admitted in federal court in recent weeks that they packed undocumented people in vans and hauled them to Ohio, where they sought work in Amish communities.
Prosecutors say the illegal immigrants gave false information to the Ohio Bureau of Motor Vehicles in Holmes County, about 65 miles south of Cleveland.
The Ohio Highway Patrol started investigating when BMV workers became overwhelmed by the large number of people seeking help.
Prosecutor Jeff Mullen said the BMV's Millersburg office usually helps about a dozen people a month get state identification cards.
He says from December through April, more than 100 people a month streamed into the office.
The Associated Press