Six Mexican veterinarians who say they were recruited to work at an Idaho dairy farm as animal scientists have filed a federal human trafficking lawsuit against the dairy’s owners and the lawyer who arranged work visas, claiming they were instead forced to work as laborers, milking cows and shoveling manure for about a year.

The veterinarians had been promised that they would oversee animal health and reproduction programs at Funk Dairy Inc. in the small southern Idaho town of Murtaugh and were brought to the U.S. on TN visas for professionals from Mexico and Canada, said the lawsuit filed in U.S. District Court in Boise on Tuesday.