Despite being a Gryffindor in the same year as Harry, the two boys had argued when Harry insulted Seamus' mother for believing the Daily Prophet's version of events. member, Marietta Edgecombe, betrayed them to Umbridge. A., having been brought to the meetings by her friend, Cho Chang.However, with the publication of an interview in The Quibbler, many, including Seamus and his mother, came to see the holes in the Ministry's stories, and Seamus willingly apologised to Harry. A being led to the room by Dean Thomas, although Seamus only was a member for the very last session when Harry Potter instead of Neville Longbottom was still the leader and teacher, because Umbridge finally found out about the organisation during this meeting. Her mother worked in the Floo Network Office and was helping Umbridge to monitor the Floo Network at Hogwarts.After Dobby told how to summon the Room to Harry, Hermione, and Ron, the D. Harry started them off slowly, practising the Disarming Charm (Expelliarmus).When Zacharias Smith scoffed at its simplicity and wondered about its effectiveness, Harry responded that it was the spell that saved him from Lord Voldemort in the Little Hangleton graveyard.After some initial scepticism, the students started to list Harry's achievements — the survival of his parents' murder at Voldemort's hands in their family home and resulting defeat of the dark wizard himself as an infant (which earned Harry his fame from the wizarding community and the title "the Boy Who Lived"), rescue of the Philosopher's Stone from a disembodied Voldemort in his first year, slaying of the Basilisk of Slytherin in the Chamber of Secrets with the Sword of Gryffindor in his second year, vanquishing of the Dementors of Azkaban at the Black Lake with a corporeal stag Patronus Charm in his third year, and winning of the Triwizard Tournament and duel with the resurrected Voldemort within the Little Hangleton graveyard in his fourth year.The group agreed that secrecy would be vital — if Umbridge found out about them, they would surely be shut down and punished.Afraid that her mother's job was in jeopardy, and not convinced by Harry's interview in The Quibbler, she revealed the location of the D. Immediately, the jinx that Hermione had placed on the parchment that each member of the D. had signed activated, causing the word "SNEAK" to break out in boils across Marietta's face.
It was originally founded with twenty-eight members.A., even though the house-elf was under orders not too.Most members escaped, but Harry was caught by Umbridge and several Slytherin students who were members of the Inquisitorial Squad.However, each student signed, some rather reluctantly, a special piece of parchment to show their commitment.Unknown to any of them, Hermione bewitched the parchment to include a jinx. A., then the word "SNEAK" would be written across their face in spots. Mundungus Fletcher, disguised as a witch with a thick black veil, was keeping an eye on Harry for the Order of the Phoenix, while Willy Widdershins informed Umbridge of the meeting in a plea-bargain to avoid punishment for a series of Regurgitating Toilet incidents.