Hitler killed my Brothers and Sisters!

from wikipedia:


Jehovah's Witnesses suffered religious persecution in Nazi Germany between 1933 and 1945 after refusing to perform military service, join Nazi organizations or give allegiance to the Hitler regime. An estimated 10,000 Witnesses—half of the number of members in Germany during that period—were imprisoned, including 2000 who were sent to concentration camps. An estimated 1200 died in custody, including 250 who were executed. They were the first Christian denomination banned in the Third Reich and the most extensively and intensively persecuted.


All they had to do was sign a paper to denounce their faith, since they did not, it pissed Hitler off cause he had no control over them, so he executed them, usually by beheading.