White supremacist extremist groups are a significant domestic terror threat in many Western nations. These groups harness the Internet to spread their ideology via online platforms: blogs, chat rooms, forums, and social media, which can inspire violence offline. In this work, we study the persistence and reach of white supremacist propaganda in both online and offline environments. We also study patterns in narratives that crossover from online to offline environments, or vice versa. From a geospatial analysis, we find that offline propaganda is geographically widespread in the United States, with a slight tendency toward Northeastern states. Propaganda that spreads the farthest and lasts the longest has a patriotic framing and is short, memorable, and repeatable. Through text comparison methods, we illustrate that online propaganda typically leads the appearance of the same propaganda in offline flyers, banners, and graffiti. We hope that this study sheds light on the characteristics of persistent white supremacist narratives both online and offline.

翻译：白人至上主义极端组织对许多西方国家构成了重大的国内恐怖威胁。这些组织利用互联网通过在线平台（博客、聊天室、论坛和社交媒体）传播其意识形态，这可能引发线下暴力行为。本研究探讨了白人至上主义宣传在线上和线下环境中的持续性与覆盖范围。我们还研究了从线上环境传播到线下环境（或反之）的叙事模式。通过地理空间分析，我们发现线下宣传在美国地理分布广泛，略倾向于东北部各州。传播最远且持续时间最长的宣传具有爱国框架，且简短、易记、可重复。通过文本比较方法，我们表明线上宣传通常先于线下传单、横幅和涂鸦中出现相同的宣传内容。希望本研究有助于揭示线上及线下持续存在的白人至上主义叙事特征。