Original sentence: , actively collaborated with the occupational forces.As the Germans and their allies began to lose ground to the anti-Nazi guerrillas in 1944, and started retiring to Albania, many hundreds of Chams followed them.During the Nazi occupation of Greece (1941-1944) many local Albanian-spoken inhabitants (see Cham Albanians), under an Axis-backed organisation called K.Muslim Cham units also played an active part in the Holocaust in Greece, including the round-up and expulsion to Auschwitz and Birkenau of the 2,000-strong Romaniote Greek-Jewish community of Ioannina in April 1944.These Albanian Cham units committed, alongside the Wehrmacht, a number of atrocities against their ethnically Greek fellow citizens, burning houses and villages, killing several hundred ethnic Greeks and forcing thousands others to flee their homes.ntil the Second World War the town had a mixed population of Greeks and Cham Albanians