The racial term "Untermensch" originates from the title of Klansman Lothrop Stoddard's 1922 book "The Revolt Against Civilization: The Menace of the Under-man". It was later adopted by the Nazis from that book's German version "Der Kulturumsturz: Die Drohung des Untermenschen" (1925). An advocate of the U.S. immigration laws that favored Northern Europeans, Stoddard wrote primarily on the alleged dangers posed by "colored" peoples to white civilization, with his most famous book "The Rising Tide of Color Against White World-Supremacy" in 1920. Alfred Rosenberg was the leading Nazi who attributed the concept of the East-European "under man" to Stoddard. As the Nazi Party's chief racial theorist, Rosenberg oversaw the construction of a human racial "ladder" that justified Hitler's racial and ethnic policies. Referring to Russian communists, Rosenbeg wrote in his "Der Mythus des 20. Jahrhunderts" (1930) that "this is the kind of human being that Lothrop Stoddard has called the 'under man.'" ["...den Lothrop Stoddard als 'Untermenschen' bezeichnete."]