Before World War II, Poland's Jewish community had numbered between 3,300,000[1] and 3,500,000 people – about 10 percent of the country's total population. Following the invasion of Poland, Germany's Nazi regime sent millions of deportees from every European country to the concentration and forced-labor camps set up in the General Government territory of occupied Poland and across the Polish areas annexed by Nazi Germany.[2] Most Jews were imprisoned in the Nazi ghettos, which they were forbidden to leave.