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Hitler then authorized SS chief leader Heinrich Himmler to centralize the administration of the concentration camps and formalize them into a system.Himmler chose SS Lieutenant General Theodor Eicke for this task.

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Aushwitz was the biggest concentration camp. It was known as a extermination & labour camp. Many lives were taken in this camp
either by gas chambers,starvation or illness.
Belzec,Poland was purposely made for exterminating jews. It was a key part of the "Final Solution" .  To begin with it was officially a transit camp,a  camp for the temporary accommodation of groups of people who are traveling through a country, and it was only later that it got the official transformation to a concentration camp
This image includes hundreds of wedding rings that were taken from the Jews before going into concentration camps. Everything was stripped from them, their hair was shaved off so lice didn't go around & rags were most often used as clothing.

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A camp in which people are detained or confined, usually under harsh conditions and without regard legal norms of arrest and imprisonment that are acceptable in a constitutional democracy.

Arrival of political prisoners at the Oranienburg concentration camp. Oranienburg, Germany, 1933.

Roll call for newly arrived prisoners, mostly Jews arrested during Kristallnacht (the "Night of Broken Glass"), at the Buchenwald concentration camp. Buchenwald, Germany, 1938.

— US Holocaust Memorial Museum

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Belzec, Poland- First extermination camp only 2 people were known to have survived.
Bergan-Belsen- Germany- Anne Frank and her sister Margot died here.
Buchenwald, Germany- This large camp held many political prisoners including writers, doctors, former nobility.
Chelmno, Poland-

this large camp opened to kill Jews of the Lodz Ghetto
Auschwitz-Birkenau, Poland- The most famous and largest of all nazi camps because of its size