"Antifa's perceived legitimacy is inversely correlated with the government's. Which is why, in the Trump era, the movement is growing like never before. As the president derides and subverts liberal-democratic norms, progressives face a choice. They can recommit to the rules of fair play, and try to limit the president's corrosive effect, though they will often fail. Or they can, in revulsion or fear or righteous rage, try to deny racists and Trump supporters their political rights. From Middlebury to Berkeley to Portland, the latter approach is on the rise, especially among young people."
Peter Beinart at The Atlantic discusses the rise of "antifa."
As does Bob Moser at the New Republic.