In Harry Potter and the Order of the Phoenix, at the end of the climax in the Ministry, Dumbledore tells the shocked Cornelius Fudge:
"Cornelius, I am ready to fight your men - and win again!" said Dumbledore in a thunderous voice. "But a few minutes ago you saw proof, with your own eyes, that I have been telling you the truth for a year. Lord Voldemort has returned, you have been chasing the wrong man for twelve months, and it is time you listened to sense!"
Who is the "wrong man" that Dumbledore is accusing the ministry of chasing for twelve months?
The first name that comes to mind is Sirius Black... but the Ministry has been on his case for much longer than twelve months (it's almost three years since the start of Prisoner of Azkaban at this point). So who else is the Ministry (wrongly) devoted on hunting down? Or did Dumbledore forget how long the Ministry has been looking for Sirius?
Note: Twelve months prior to this incident, which would have been June 20, 1994, is around the time Harry Potter returned to Hogwarts with Cedric's body at the end of the Third Task. Did the Ministry even start chasing anyone at that time?