По показаниям Игоря Каркарова Мальсибер неоднократно применял заклятие «Империус

“Any more?” said Crouch.
“Yes!” said Karkaroff. “There was Travers—he helped murder the McKinnons! Mulciber—he specialized in the Imperius Curse, forced countless people to do horrific things! Rookwood, who was a spy, and passed He-Who-Must-Not-Be-Named useful information from inside the Ministry itself!”

вряд ли это была непростиловка на самом деле