Even to casual observers, it’s clear that white supremacist groups and their cousins, the militias, have been in full swing for years. And it’s also clear that the departure of Donald Trump from the White House has not collapsed the far right. A newly released annual census of these groups by the Southern Poverty Law Center (SPLC), “ The Year in Hate and Extremism 2021 ,” which quantifies the far right’s ideological trends, shows that even as most in-person far right groups have declined, the violent Proud Boys group has grown, and new online forms of far right organizing have...