Londoners Fly To German "Slave Labour" Test Case R.W. Ferris (left) and Charles C.J. Coward, Both of London and former prisoners of war in Germany, arrive by air in Frankfurt today February 18. They are to give evidence in a claim by a former "Slave Labourer" against the I.G. Farben Combine. It is a test case for more than 100 other former "Slaves." Coward and Ferris are to speak for a former concentration camp inmate, Norbert Wolheim, now living in USA, who claims £833 as wages for work in the Buna-Monowitz syn synthetic rubber plane, near Auschwitz, during the war. February 18, 1953. (Photo by Associated Press Photo).