I'm sorry, but you're going to have to be specific. Saying "antifa" does not imply a singular group. The same way "KKK" does not imply a singular group.

If you'd checked the example you rely upon further down you'd have seen that in fact the individual Al-Qaeda groups are listed specifically in the State Department's listed of Foreign Terrorist Organizations. Now obviously I don't have the authority to say why that is, but it seems reasonable to presume that they are listed as separate organizations because they are, in fact, separate organizations.

Not necessarily. You don't want vague language in official documents, so you have to be specific, because you'd just shift the problem if you said "Al-Qaeda", since you now need an official list of Al-Qaeda-Subgroups.

If it would allow nesting, I'm pretty sure somebody would've already accidentally put Al-Qaeda under Ansar al-Sunna and cause a recursion error, blowing up DC.

"The United States of America will be designating ANTIFA as a Terrorist Organization"

https://twitter.com/realdonaldtrump/status/12671296442282475...

Terrorist organisations are not necessarily singular groups. Al-Qaeda for example.

Trump tweeted: "The United States of America will be designating ANTIFA as a Terrorist Organization". This implies a singular group, a singular group which the consensus seems to be does not exist.

It does not imply a singular group. For example, Al-Qaeda is classified as a terrorist organization despite being made up of several structures and groups.

It implies a collective.