The Unite the Right rally was the largest public gathering of white supremacists in a generation. Experts who study hate groups say their ranks are growing as social media makes connecting easier and the guardrails that reined in overt displays of racism have begun to come down. A study of flourishing white supremacist networks on Twitter in 2016 found that two hashtags drew the most retweets: #WhiteGenocide and #DonaldTrump.
