Officials with the group Voces de la Frontera say Castro is married and has four U.S.-born children. He has been in the country for 30 years and has lived in Lake Geneva for 17 years. He runs a small pallet business that employs three people.
The group says the only blemish on Castro's record is a drunken driving citation more than 12 years ago.
A spokesman for U.S. Immigration and Customs Enforcement did not return a message Tuesday seeking comment.