By Michelle Goldberg

The month after Donald Trump’s inauguration, the Yale historian Timothy Snyder published the best-selling book “On Tyranny: Twenty Lessons From the Twentieth Century.” It was part of a small flood of titles meant to help Americans find their bearings as the new president laid siege to liberal democracy.

One of Snyder’s lessons was, “Be wary of paramilitaries.” He wrote, “When the pro-leader paramilitary and the official police and military intermingle, the end has come.” In 2017, the idea of unidentified agents in camouflage snatching leftists off the streets without warrants might have seemed like a febrile Resistance fantasy. Now it’s happening.

According to a lawsuit filed by Oregon’s attorney general, Ellen Rosenblum, on Friday, federal agents “have been using unmarked vehicles to drive around downtown Portland, detain protesters, and place them into the officers’ unmarked vehicles” since at least last Tuesday. The protesters are neither arrested nor told why they’re being held.

There’s no way to know the affiliation of all the agents — they’ve been wearing military fatigues with patches that just say “Police” — but The Times reported that some of them are part of a specialized Border Patrol group “that normally is tasked with investigating drug smuggling organizations.”

Read more at the The New York Times.