Barty Crouch, Sr.

Bartemius "Barty" Crouch is head of the Department of International Magical Cooperation in the Ministry of Magic, the boss of Percy Weasley after Percy has left school. He sentenced Sirius BLack to Azkaban without a trial.

He is also the father of Barty Crouch, Jr., who after discovering that he was a death eater, sent him to azkaban.