ss sergeant oskar groening - known as ` the bookkeeper of auschwitz ' - set to go on trial charged with complicity in the killing of 300,000 jews at the nazi extermination camp .
auschwitz survivors and relatives of those murdered there filed into court today for the trial of 93-year-old oskar groening - who may well have met their loved ones shortly before they were gassed .
they spoke of their pain , pride and duty in confronting this ` cog ' in the machinery of genocide .