Gestapo and the SS
The Gestapo was the official secret police of Nazi Germany. Another important tool of Nazi terror was the Protective Squad (Schutzstaffel), or SS, which began as a special guard for Adolf Hitler and other party leaders.
http://www.jewishvirtuallibrary.org/jsource/Holocaust/Gestapo.html
http://www.ushmm.org/wlc/en/article.php?ModuleId=10007401
http://www.theholocaustexplained.org/ks4/the-nazification-of-germany/the-nazis-consolidate-power/the-role-of-the-ss-and-gestapo/#.UTaPNI5HVbk
http://www.ushmm.org/outreach/en/article.php?ModuleId=10007675
http://www.ushmm.org/wlc/en/article.php?ModuleId=10007403
http://www.ushmm.org/wlc/en/article.php?ModuleId=10005130
http://www.jewishvirtuallibrary.org/jsource/Holocaust/Gestapo.html
http://www.ushmm.org/wlc/en/article.php?ModuleId=10007401
http://www.theholocaustexplained.org/ks4/the-nazification-of-germany/the-nazis-consolidate-power/the-role-of-the-ss-and-gestapo/#.UTaPNI5HVbk
http://www.ushmm.org/outreach/en/article.php?ModuleId=10007675
http://www.ushmm.org/wlc/en/article.php?ModuleId=10007403
http://www.ushmm.org/wlc/en/article.php?ModuleId=10005130