 Comics scholar Roger Sabin sees this as a reflection of "the liberal idealism of Franklin Roosevelt's New Deal", with Shuster and Siegel initially portraying Superman as champion to a variety of social causes.In later Superman radio programs the character continued to take on such issues, tackling a version of the Ku Klux Klan in a 1946 broadcast, as well as combating anti-semitism and veteran discrimination.Scott Bukatman has discussed Superman, and the superhero in general, noting the ways in which they humanize large urban areas through their use of the space, especially in Superman's ability to soar over the large skyscrapers of Metropolis.