Final answer:
The activity performed by a Nazi official that earned him the title "Angel of Death" was medical experimentation.
Step-by-step explanation:
The activity performed by a Nazi official that earned him the title "Angel of Death" was medical experimentation. One infamous Nazi official who is often associated with this title is Dr. Josef Mengele. He conducted cruel and inhumane experiments on prisoners, especially at the Auschwitz concentration camp in Poland during World War II.
Learn more about Nazi officials and their activities