There is no doubt that Antifa is a terrorist organization. In the US and elsewhere. I remember in the early 2000s, reading an article in the Economist comparing Al Qaeda with early century anarchist movements in the US and Europe. I'll try and dig it up.

"The FBI will immediately put the leader of Antifa on its Top Ten Most Wanted Fugitives List"

Antifa is not Brigate Rosse or Rote Armee Fraktion. It's an ideology, not an organization.

"The people who want to shut Antifa down are white supremacists and fascists."

Or they just don't want to see their neighborhoods burned, cars set on fire, and ATMs destroyed.

That's pretty much everyone.

They characterize themselves as anti-fascist, but only so far as they are anarchists whose beliefs are just as violent and suppressive as the fascists they purport to align against. They are not the good guys, unless you also share the entirety of their beliefs. Few do.

"For jihadist, read anarchist"

"BOMBS, beards and backpacks: these are the distinguishing marks, at least in the popular imagination, of the terror-mongers who either incite or carry out the explosions that periodically rock the cities of the western world. A century or so ago it was not so different: bombs, beards and fizzing fuses. The worries generated by the two waves of terror, the responses to them and some of their other characteristics are also similar. The spasm of anarchist violence that was at its most convulsive in the 1880s and 1890s was felt, if indirectly, in every continent. It claimed hundreds of lives, including those of several heads of government, aroused widespread fear and prompted quantities of new laws and restrictions. But it passed. Jihadism is certainly not a lineal descendant of anarchism: far from it. Even so, the parallels between the anarchist bombings of the 19th century and the Islamist ones of today may be instructive."