Because of Marcus' Jewish ancestry, his name and all memorabilia, particularly in Austria, vanished under the Nazis. In 1937 the Austrian Harand Movement Against Racial Hatred had issued a series of stamps featuring prominent Jews, including Marcus, who had contributed to mankind in response to the "Ewiger Jude" (eternal Jew) exhibition by Julius Streicher in Munich. Marcus was credited as having invented the petrol driven motor car. With the German occupation of Austria in March 1938, the memorial in front of the Vienna Technical University was removed. After World War II, the monument was rebuilt and his car, which had been hidden, was returned to display.