His mother, Riri, immigrated to Israel in 1951 from Romania. At the age of 6, she was sent to a labour camp in Transnistria. Like the majority of the bikers, his parents told him little about their experiences at the hands of the Nazis and their collaborators. It was during filming that he discovered that his grandfather, Leopold, was held and tortured at the same Bucharest prison as Marco Katz’s relatives. Dr Munz showed great insight into the relationships and dynamics of the 2015 bikers and proved an invaluable participant.