Book 7 | Ch:12 - Magic is Might

SPOILERS:

Harry, Ron and Hermione, after weeks of planning, ambush three Ministry workers, assume their identities, and sneak into Ministry headquarters. To their horror, they learn that Ron has taken the identity of a man whose wife is about to be interrogated about her blood status, and who faces a sentence in Azkaban for being a Muggle-born with a wand.