With the outbreak of the war, Nazi Germany invaded Poland, the home of more than 3 million Jews. From this juncture, Nazi policy took shape of a plane prosecution. This policy, which before the outbreak of the war put pressure on Jews to leave Europe. Changed to one of isolating them from the general population and confining them to ghettos. From 1939 to 1941, around three million Jews were forced into ghettos, where living conditions were made extremely harsh. Along with extreme starvation, the ghetto dweller suffered from overcrowding, bitter cold weather, outbreak of epidemics, and terrible housing conditions. Many of the dwellers were sent to exhausting forced labor sites. Tens of thousands died in the ghettos from starvation and misery. And others barely survived under condition of extreme poverty and malnutrition. Occasionally, the Nazi initiated massacre, torture, and cruelty against helpless and innocent poor people. Yet, despite the death and bereavement, the Jews managed to sustain some form of human and social life. They continued to love, marry, give birth, study, and practice Jewish ceremonies and holidays, despite the unbearable conditions. And that's the appointed Jewish council that organizes life in the ghetto. They insisted on maintaining public order and basic hygiene. Providing education for the children, promoting cultural activity and keeping some basic communal service. In the Warsaw ghetto we've housed more than half a million Jews, children went to school. Theater groups, stage plays, and orchestras gave concerts. Several Jewish newspapers were published and the article described the ghetto life. Youth movement operated in the ghetto. Giving youngster guidance and tried to soothe their suffering. After the conquest of Western Europe, the German moved Eastward to invade the Soviet Union. Upon the advance they conducted thousands of mass murder of Jewish community that lived in those areas. Special German mobile death squad with the assistant of local collaborators, assassinated Jews in mass graves in many places. Until the end of 1941 the Nazi killed about 1.5 million Jews through starvation, mass shooting, pogroms, forced labor, and other methods of execution. Entire Jewish villages were liquidated, but the scope of Jewish annihilation fell short of the Nazi aim of total eradication of Jews from the Earth. In January, 1942, senior Nazi government and security officials met in Berlin in order to speed up the pace of Jewish extermination. Known as the Wannsee conference, the officials of this meeting decided to adopt a new scientific method of killing, the gas chamber. This method had been used in Germany to kill mentally retarded and terminally ill, but was stopped due to public criticism. It was restored against the Jews and other enemies of the Third Reich in 1942. Death camps were set up in Poland. The largest of which, Auschwitz was built near a railway junction. Jews were transported to the death camp from all over Europe where they were murdered systematically by the gas Zyklon B. After the mass killing, the bodies were cremated in large furnaces next to the gas chamber. In these extermination camps, which operated like an assembly line, the death industry reached its highest point of efficiency. More than 1.5 million Jews were murdered in Auschwitz-Birkenau alone. About a million more in death camp Treblinka. More than a million in other extermination camps. Towards the end of the war, as the German were headed toward defeat. They were even more committed to complete the mission of Jewish extermination. Therefore, they intensified the pace of the murder industry. The camp system operated until 1945. As the Germans retreated, they dragged along with them by foot, hundreds of thousands of Jews in what came to be known as the death marches. Weakened by years of living in ghettos and camps, many Jews died during these marches or were shot by the Nazis. The murder of the Jewish people continued until Germany's final surrender in May 1945. By the second half of 1942, Western countries started to receive reliable information about the murder of Jews in Europe. Leaders of the free world did nothing to stop the crime, claiming that the Jewish plight would end with the ultimate defeat of Nazi Germany. Indeed, this day came too late for the estimated six million Jewish victims of the Holocaust. 90% of 3.3 million Polish Jews were murdered. 90% of the Jews of the Baltic states suffered the same fate. Half of the Jews of Russia and Ukraine were assassinated. 75% of Hungarians Jews, 75% of just Dutch Jews, and half of the Romanian Jews had been killed. All in all, one-third of the Jewish people were exterminated. The Holocaust destroyed 70% of European Jewish communities basically erasing Jewish way of life in Europe. Yet it is important to remember that even during that dark time thousands of Christians maintained their humanity and rescued Jews at the risk of their own lives and those of their families. These people are later referred to as righteous gentiles. The Holocaust was the most devastating catastrophe in the history of the Jewish people. The tragedy occurred in Europe being the second world war and the whole world stood by and allowed it to happen. It have an enormous impact on the Zionist movement and on the life of the Jewish community in Palestine during these years and shortly afterwards.