The RSHA, or Reichssicherheitshauptamt (Reich Main Security Office or Reich Security Main Office or Reich Security Head Office) was an organization headed by Heinrich Himmler. This was in his dual capacities as Chef der Deutschen Polizei (Chief of German Police) and Reichsführer-SS. The organization's stated duty was to fight all "enemies of the Reich" inside and outside the borders of Nazi Germany.
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Reichssicherheitshauptamt Facts for Kids. Kiddle Encyclopedia.