Nick Fuentes. (Photo illustration: Yahoo News; photos: Rainmaker Photos/MediaPunch /IPX via AP, Nicole Hester/Ann Arbor News via AP) Before last week, most Americans had never heard of Nick Fuentes, the white nationalist Holocaust denier who recently dined with former President Donald Trump and Kanye West, the Grammy-winning rapper-turned-outspoken antisemite, at Trump’s Florida estate. Since his pre-Thanksgiving meal at Mar-a-Lago, however, the 24-year-old’s name and laundry list of bigoted beliefs have been the subject of countless mainstream news articles, cable news segments and late-night talk show monologues. For extremism experts who study the far right and have been following Fuentes’s activities...