In 2018, Greene shared a video, "With Open Gates: The Forced Collective Suicide of European Nations" repeating the antisemitic white genocide conspiracy theory that Zionists are conspiring to flood Europe with migrants to replace the native white populations. The video, uncovered by Media Matters, said that those supporting refugees are using "immigrant pawns" to commit "the biggest genocide in human history". In sharing the video, Greene wrote that: "This is what the UN wants all over the world". The white genocide conspiracy theory has been associated with white supremacy and espouses the unsubstantiated belief that white people, in a "Great Replacement", will eventually become a minority in Europe and North America due to declining white birth rates and high rates of immigration. Greene has also falsely called George Sorosa Jewish businessman and Holocaust survivora Nazi. She promoted the conspiracy theory that Soros' family collaborated with the Nazis in Hungary and is "trying to continue what was not finished".