IWW union directory Department 600 - Public Service has 6 entries, a number of them are in Oregon. Burgerville Workers Union, Little Big Union, New York City Industrial Union Branch 630 & 640 / Stardust Family United, Santa Cruz Education Workers Local IUB 620,

Social Justice Education Movement (SJEM), Voodoo Doughnut Workers Union. Some of these don't have websites, like the SJEM only has a FB page.

SJEM in based in Minneapolis, MN and pushes to change education to "Abolitionist Teaching" and is a Union for education workers.

I also found the GDC website for Twin Cities MN. Looks like Antifa make signs and march rather than a union action.
https://twincitiesgdc.org/ 

They posted and interesting article about Keith Ellison Tweeting the "Antifa: The Anti-Fascist Handbook."
@SomeBitchIKnow did a great thread with him in it, and I just can't find it now.
https://twincitiesgdc.org/2018/01/23/twin-cities-gdc-sets-record-straight-on-ellison-antifa-tweet/

Twitter account suspended, FB page is a broken link, last website update is 2019. I did find an archive of their twitter. It's hard to deny the Antifa connection when you read the things they write.
http://web.archive.org/web/20190616210554if_/https://twitter.com/tcgdc

Next thread will be longer and explore the connections with other unions and the suprising numbers in Portland.