Fred appears in the 1900 US census in Mayhew Lake Township, Benton County, MN as "Marchlowitz".
I am wondering whether the John "Marchlowitz" that was in Minden Township, Benton County, MN in 1900 is any relation to Fred. John later moved to Pierce County, Wisconsin. He was a brother to one of my great great grandmothers. If Fred is also a brother, you may wish to know that their mother Anna Marchlowitz (nee Weiss) is buried in Minneola Township, Goodhue County, MN.
The younger children of John Marchlowitz changed the name to Marklevits, BTW. John, wife and two eldest sons are buried in Bay City, WI with name Marchlowitz.