Why are white supremacist and neo-Nazi groups popping up at pro-Palestinian rallies across America, including most recently in Washington, D.C.; Orlando, Florida; Boston; and Missoula, Montana? I’ll give you a hint: It’s not because they care particularly about the situation in Gaza. No, for these groups, the large-scale protests across America present a golden opportunity to mainstream the same antisemitic tropes they have been pushing for years and, if they get their way, create new opportunities for extremist violence.