1) The Nazi Holocaust was an act of geneside, where aproximatly 6 million Jews were executed.
2) The Nazi's killed millins of Jews because they felt they were a lower class and threat to their race.
3) The Nazis would arrest hundreds of Jews and take them to Poland, were there were Concentration Camps, and they would be executed by various means. (Gass, Shot, Poisond)
4) The world involved in the war would make Concentration Camps a priority target to liberate the prissoners. After the war, many countrys supplyed resorses to the liberatees, to get their lives going again.