Antifa is not one organization, that's ridiculous. It would be like claiming that "Anarchists" are a terrorist organization.

Feel free to send the White House a letter complaining. I did not write the big "ORGANIZATION" in the title of that EO. Or is it just bike shedding?

The objection is the administration is inventing a group wholesale in order to designate those who oppose their policies as terrorists. The executive order can say whatever, that doesn't make it factual.

Antifa is a decentralized organization: shared branding, shared tactics (borrowed from neo-nazis), chapters/affinity groups, mutual aid and coordination across cities.

Anarchism is a philosophy. Antifa is an actual terrorist network.

Ridiculous. I am anti fascist, and I have never heard of any of what you are talking about.

I oppose fascism.

That does not magically infuse into my brain mysterious connections to groups of people, nor instantaneous knowledge and mastery of tactics from nazi groups...

That would be actually kind of cool, but no, sorry to disappoint you.

You link to that press release like it means something more than changing a lake's name by fiat.

Yeah, yeah, soon any opposition to Trump or Israel is deemed terrorist...

It's not soon, it's literally right now.

It's getting there. Right now there is still free opposition to Trump.

Antifa is as much of an organization as Anonymous.

The United States classified Nelson Mandela a terrorist until 2008.

Antifa isn't an organisation at all. It's a loosely defined ideology / set of tactics that leftist movements (everything from black block kids to local democratically organised spaces) sometimes use or follow.