Law enforcement officials, technology companies and lawmakers have long tried to limit what they call the “radicalization” of young people over the internet.

The term has often been used to describe a specific kind of radicalization — that of young Muslim men who are inspired to take violent action by the online messages of Islamist groups like the Islamic State. But as it turns out, it isn’t just violent jihadists who benefit from the internet’s power to radicalize young people from afar.

White supremacists are just as adept at it. Where the pre-internet Ku Klux Klan grew primarily from personal connections and word of mouth, today’s white supremacist groups have figured out a way to expertly use the internet to recruit and coordinate among a huge pool of potential racists. That became clear two weeks ago with the riots in Charlottesville, Va., which became a kind of watershed event for internet-addled racists.

“It was very important for them to coordinate and become visible in public space,” said Joan Donovan, a scholar of media manipulation and right-wing extremism at Data & Society, an online research institute. “This was an attempt to say, ‘Let’s come out; let’s meet each other. Let’s build camaraderie, and let’s show people who we are.’”