What is the name of the dark wizard who was a master of the Imperius Curse?
Barty Crouch Jr.
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> What is the name of the dark wizard who was a master of the Imperius Curse? [/INST] Barty Crouch Jr. </s>