A memorial brass kerbstone was unveiled on Friday in Hamburg’s St. Pauli district to highlight the tragic fate of female sex workers in the German city’s red-light area during the Nazi era. Thousands of tourists use the iron gates, which block the view of the Bordellgasse, or Brothel Alley, as a backdrop for selfies, Sieghard Wilm, the project’s initiator, said at the ceremony. But few know that the gates on the corner of Herbertstrasse and Davidstrasse were erected in 1933 on the orders of the Nazi political leadership to demarcate the sex trade. “It corresponds to the cynical and inhumane po…