But antifa is an activity, not an organization. Anyone can do antifa simply by opposing local fascist activity. It may be as simple as covering up fascist graffiti, or punching Richard Spencer. Some people do it with their friends, others alone. Every little bit helps, but more helps more. Try not to endanger yourself or non-fascists.
There are many fascist and fascist-leaning groups and individuals, and many opposing them. Anyone may oppose them, without need for permission. Organizing with local others can produce greater effect. That also does not require permission.
Any existing organization may choose to engage in anti-fascist activity, possibly in coördination with other groups. That also does not imply an "Antifa" organization.
Opposition to fascism is everyone's responsibility. How that opposition may best be effected varies with circumstance. Rooting out fascism in police departments is an obviously important part of anti-fascist activity.
Why should a company still feel like this is appropriate to publish?
Or this image: https://www.nepm.org/sites/wfcr/files/styles/medium/public/2...
Should we still be publishing this: https://imgur.com/ykQpXON
Just like with tech companies' internal political culture or newsroom revolts sweeping all the major journalism houses, publishers have themselves experienced both internal employee activism and external pressures. Consider for example, that employees in Penguin House were in literal tears (https://reason.com/2020/11/25/jordan-peterson-12-rules-for-l...) because they decided to publish Jordan Peterson's new book. Or observe how activists associated with Rose City Antifa in Portland, Oregon tried to stop a local landmark book store (Powell's) from selling Andy Ngo's book "Unmasked", which details the criminal activity of local antifa cells (https://pen.org/press-release/pen-america-supports-powells-d...).
Book burning was once a far-fetched joke but it really is very much upon us. And it doesn't have to come in the literal form of a book burning. It's enough for the threat of "cancellation" to force the hand of authors, publishers, or retailers.