High Inquisitor

The Hogwarts High Inquisitor is a teacher appointed by the Ministry of Magic to make sure that unsatisfactory teachers were removed from Hogwarts School of Witchcraft and Wizardry.

Known High Inquisitors
Dolores Jane Umbridge

The Inquisitorial Squad
For more information, see the Inquisitorial Squad

The Inquisitorial Squad was like the High Inquisitor's Prefects. They were, however, given the power to take away and add house points.

End of the High Inquisitor's Reign
Dolores Umbridge, the first and only Hogwarts High Inquisitor, was removed from her post following the Battle for the Prophecy. Disputed facts are that she resigned from her positon due to rampaging cenetaurs in the Dark Forest.

Umbridge had been lured there, thinking a weapon had been built by Dumbledore's Army was there. Hermione Granger had been the one who came up with the plan, if only to save Harry James Potter from Umbridge's Cruciartus Curse.

The Battle of the Dark Forest
''You filthy half-breeds! You have been given the right to stay here by Cornelius Fudge!'' -Dolores Umbridge.

The Battle of the Dark Forest was not really a battle, but a fight. The cenetaur tribe that had ditched Firenze had found Harry, Hermione, and Umbridge walking through the forest. They imprisoned the trio, but Grawp helped them escape.