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The Nazi police state included an organization called the Security Service ( German : Sicherheitsdienst ) , generally referred to as the SD , and its headquarters in Berlin was known as the National ( or Reich ) Security Main Office ( Reichssicherheitshauptamt ) , known by its initial RSHA .
 Nazi, Berlin, Reichssicherheitshauptamt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nazi, Berlin, Reichssicherheitshauptamt