The gesture is widely known for saying things are "good-to-go.". But, it has now been added to a database by the Anti-Defamation League (ADL). The ADL says the sign has been hijacked by the alt-right, white nationalists and other extremists. The organization explains that hateful use of the "OK" sign started as a hoax on the website 4Chan.org. . Extremists then took it as a symbol of white supremacy and have since adopted it. At least some white supremacists seem to have abandoned the ironic or satiric intent behind the original trolling campaign and used the symbol as a sincere expression of white supremacy, ADL, via statement. The ADL also points to use of the symbol by mass killers, such as Australian gunman Brenton Tarrant. This past March, Tarrant killed over 50 people in two mosques in Christchurch, New Zealand. He was reportedly seen making the "OK" sign in court.