Harry turned into a high-ranking Ministry of Magic official named Albert Runcorn after he took Polyjuice Potion in Harry Potter and the Deathly Hallows. He soon realized that Albert Runcorn was an important member of the Ministry, as a lot of wizards and witches seemed to fear him. Harry even managed to smuggle himself into Dolores Umbridge's office without anyone questioning him, probably because he was disguised as Albert Runcorn.