Operation Denver was an active measure disinformation campaign run by the KGB in the 1980s to plant the idea that the United States had invented HIV/AIDS as part of a biological weapons research project at Fort Detrick, Maryland. Historian Thomas Boghardt popularized the codename "INFEKTION" based on the claims of former East German Ministry for State Security (Stasi) officer Günter Bohnsack, who claimed that the Stasi codename for the campaign was either "INFEKTION" or perhaps also "VORWÄRTS II". However, historians Christopher Nehring and Douglas Selvage found in the former Stasi and Bulgarian State Security archives materials that prove the actual Stasi codename for the AIDS disinformation campaign was Operation Denver. The operation involved "an extraordinary amount of effort – funding radio programs, courting journalists, distributing would-be scientific studies", and even became the subject of a report by Dan Rather on the CBS Evening News.