In his 1936 Hitler: A Biography, German historian Konrad Heiden remarked that within the SA ranks, there were "large numbers of Communists and Social Democrats" and that "many of the storm troops were called 'beefsteaks' – brown outside and red within."[46] The influx of non-Nazis into the Sturmabteilung membership was so prevalent that SA men would joke that "In our storm troop there are three Nazis, but we shall soon have spewed them out."[46]