From the mid-1920s until the end of his life August Sander worked on his monumental photographic project ‘People of the 20th Century’. He classified more than 500 photographs into seven groups representing the social structures and transformations of the time, documenting and cataloguing the different professional classes and employment divisions in his native Germany. Shortly after World War II, in the mid-1940s, he composed two portfolios of photographs that dealt with the elimination of certain social classes and groups by the Nazis. The portfolio entitled ‘Political Prisoners’, from the group ‘The City’, shows men incarcerated in Siegburg Prison who did not conform to National Socialist politics. The portraits were taken by Sander’s son Erich, who had been persecuted because of his involvement with the ‘Sozialistische Arbeiterpartei Deutschlands [Socialist Workers’ Party of Germany]’. A trained photographer, Erich was assigned the task of taking photographs for the Nazi’s documentation purposes during his imprisonment.