Hellfire Club

The Hawkins High "Hellfire Club" was an official D&D club at Hawkins High School headed by Eddie Munson. Members Dustin, Mike and Lucas are also members of another D&D party.
In March 1984, Eddie, serving as Dungeon Master, created and hosted the "The Cult of Vecna"campaign. Shortly after this, a string of horrific murders were committed around Hawkins by an unknown person. Dustin and his friends, inspired by Eddie's campaign, dubbed the murderer "Vecna".
Jason Carver, another Hawkins High student, believed Eddie was responsible for the killings, and espoused his view that Hellfire was a Satanic cult. This narrative took hold amongst the townspeople, and following Eddie's death, news outlets falsely depicted him as a cult leader.