The United States Supreme Court has held that the due process clause of the fourteenth amendment requires notice by mail to mortgagees prior to a tax sale.
Mennonite Board of Missions v. Adams, 103 S. Ct. 2706 (1983).
Christopher H. Connors,
Notice - Constitutional Law - Tax Sales,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol23/iss3/13