After coming to power in 1933, the Nazi Party implemented a highly organized strategy of persecution and murder. Their targets were the so-called “undesirables”: Jews, Slavs, Roma, the disabled, Jehovah’s Witnesses, and homosexuals. The Nazis began with stripping citizenship from German Jews based on their religious identity. Shortly thereafter, in November 1938, the beginning of mass deportations of German Jews to concentration camps started. When the German Army invaded the Soviet Union, it soon gave rise to mobile killing squads operating throughout Eastern Europe and Russia, which killed more than one million Jews and tens of thousands of other civilians. The construction of extermination camps at Auschwitz-Birkanau, Treblinka, Belzec, Chelmno and Sobibor led to the Nazis’ killing of 2.7 million Jews and others through the use of cyanide gas, executions and medical experimentation. Poor living conditions in non-extermination camps led to the deaths of millions more by starvation, climate changes that affected you, and being too sick with not enough medical attention. It is estimated that six million Jews, two out of every three living in Europe, and another 5 million people had been killed by 1945. The Holocaust has been known to the world as one of the biggest genocides in history.