He manipulated the press, using the Daily Prophet to spread lies about the two, and installed an operative within Hogwarts in the person of Dolores Umbridge.
And sure enough, the man Harry had seen in the Daily Prophet was following along in Percy's wake, limping slightly, his mane of graying hair and his black cloak flecked with snow.
In the wizarding world, the Daily Prophet newspaper's black-and-white articles are punctuated by photographs that show several seconds of the subject's movement.