One of this group's leaders was assassinated in Op
One of this group's leaders was assassinated in Operation Anthropoid. They came to power after an event which was initiated using the code word "hummingbird." As part of one operation, this organization controlled units called Einsatzgruppen. The ODESSA program was created to help members of this organization escape to places like South America. They grew out of a group that was purged during the Night of the Long Knives, the SA, and included an armed "Waffen" branch. For 10 points, name this paramilitary branch of the Nazi Party responsible for overseeing much of the Holocaust, which was headed by Heinrich Himmler.