The Black and the Green (St. Clair Bourne, 1983) on @criterionchannl.bsky.social was a great followup to Union. It's about Black activists going from America to Belfast to express their solidarity with the Irish revolutionaries during the Troubles. A beautiful portrait of solidarity as a practice.
I know some were lukewarm on Union (Brett Story & Stephen Maing, 2024), but IMO it's brilliant. By laser-focusing on Amazon, it manages to be pro-union without indulging in any sentimental nostalgia. So great to see today's unions treated as aesthetically interesting and politically relevant topics.