The network of camps and ghettos set up by the Nazis to conduct the Holocaust and persecute millions of victims across Europe was far larger and systematic than previously believed, according to new academic research.Related StoriesTurkish PM Recep Tayyip Erdogan under fire from US after calling Zionism a 'crime against humanity'Video: Polish women save bus passengers after driver passes outBeppe Grillo suggests Italy might leave the EuroDog 'saved life' of Polish toddler who went missing in freezing temperaturesLech Walesa shocks Poland with anti-gay words