Court records show Christopher Seal and his wife, Surina, divorced in 2007.
In December 2009, the woman married Marin Limbas, who worked with Seal at a manufacturing plant.
Limbas' girlfriend, Ludmila Bacioi, married Christopher Seal in March 2009.
All four admitted on Wednesday to filing fraudulent documents with immigration authorities in an attempt to gain permanent residency for the Moldovans, who entered the U.S. legally on temporary work visas.
U.S. District Judge Kristi DuBose sentenced the Moldovans to time served and ordered them turned over to immigration authorities for deportation.
The Americans will be sentenced in September.
Information from: Press-Register,