Sure, not all strikes are officially in the name of the grad students, but (a) the unions act together, and (b) the grad students specifically have gone on strike 3 times since 2013.

Here's the strike from 2013, with grad students and service workers going on strike together: https://afscme3299.org/media/news/ucsc-service-workers-grad-...

The comments on this UCSC reddit thread discuss how the unions have been coordinating their strikes over the last 3 years: https://old.reddit.com/r/UCSC/comments/ese6sz/to_everyone_wh...