Marc Berkowitz and his twin sister Francesca were two of Mengele’s victims. Arriving at Auschwitz from Czechoslovakia in March 1944 with their mother, 12-year-old Marc and his twin sister, Francesca, were singled out by Mengele for medical experimentation:

"Before the experiments began, Mengele came and tattooed my number personally. They put us in freezing baths, smeared chemicals on our skin, but it was the needles we were most afraid of. After the first 150 injections I stopped counting ... One morning in July 1944 I spotted my mother among a long line of women moving toward the gas chamber. Mengele called me in and gave me an errand to the crematorium. He knew I would see my mother go to her death. A couple of days later he asked me if I still believed in God."

Years later, Marc Berkowitz still suffered from pains due to the injections.