Report: FBI monitored KKK-and-ISIS-loving teen triple-murderer for months Palm Beach Sheriff's Office had reportedly been keeping tabs on William T. Dwyer High School student Corey Johnson since he was in middle school. Back then, officers say he told them he had similar beliefs to the KKK, called himself a "white supremacist," and made anti-Semitic and anti-gay statements. His parents and grandparents said the boy had a fascination with Adolf Hitler, Joseph Stalin, and Kim Jong Un. Weeks after police interviewed Johnson in Dec. 2016 about his bigoted beliefs, investigators said they believed the student was interested in joining ISIS. Federal and local authorities monitored Johnson's social media posts for months after that. The FBI told Johnson to stop all social media activities related to ISIS and any other terrorist group. On Feb. 12, when Jupiter police asked the FBI where it stood on bringing federal charges against Johnson, the federal law enforcement agency replied that affidavits for the teen's arrest would be "coming in the next several weeks." On Monday, Johnson stabbed three people to death in Ballenisles Country Club, in Palm Beach Gardens, during a sleepover, police reports state. After his arrest, 17-year-old Johnson told investigators he murdered 13-year-old Jovanni Sierra, 43-year-old Elaine Simon and her 13-year-old son, Dane Bancroft, because of affronts to his Islamic beliefs.