White nationalist Dylann Roof appears in court on June 19, 2015, after his arrest in the mass shootings at a Black church in South Carolina.
Grace Beahm-Pool/Getty Images
Since 2017, the FBI has warned US Congress that the rise of white nationalism and the violence of extremist militia groups is a dangerous domestic terrorism threat.
A police officer pushes an antifa demonstrator out of the way during a 2019 protest in Washington, D.C.
Evelyn Hockstein/For The Washington Post via Getty Images
Two websites, one taken offline, the other still active, raise hard questions about how prepared Americans are to deal with free speech about white supremacy, in both monuments and domain names.
When you wash your best sheets for nothing.
EPA/Erik S. Lesser
At this time, researchers cannot prove a direct relationship. But social learning theory shows that people learn from one another, via observation, imitation and modeling.