From Pittsburgh to Poway and Charleston to El Paso, white supremacist extremists (WSEs) pose a clear terrorist threat to the United States. And while extremist groups operating on American soil are often labeled or categorized as domestic terrorist organizations, this report will demonstrate that they maintain links to transnational networks of like-minded organizations and individuals, from Australia, Canada, Russia, South Africa, and elsewhere. The danger of terrorism is growing in the United States, just as it is elsewhere in the world, with white supremacist extremists strengthening transnational networks and even imitating the tactics, techniques, and procedures of groups like al-Qaeda and the Islamic State (IS). These networks share approaches to recruitment, financing, and propaganda, with Ukraine emerging as a hub in the broader network of transnational white supremacy extremism, attracting foreign recruits from all over the world.