According to the site referenced below, Irma Grese, a Nazi guard, was one of the most brutal Auschwitz
Concentration camp figures during the World War II. She despised the beautiful Jewish women and sent them to the gas chamber first.
Ref. Auschwitz History
Image from Wikimedia public domain.
Fortunately, not everyone who were bullied when they were young turn into sadist once given the chance. You can see here how someone bullied, given the opportunity to be one herself, turned into a monster full of envy and hate.