Rheinische Zeitung
Theodor Hagen [often spelled Theodore Hagen] (15 April 1823 Hamburg - 27 December 1871 New York City) was a writer on musical topics in Germany and the United States. He was a member of the local Communist League in Hamburg, Germany and took part in the publication and distribution of the "Neue Rheinische Zeitung Politisch-ökonomische Revue".