The back story here is that United Auto Workers (the UC grad students’ union) negotiated an unacceptable contract, and despite many months of pushback from the students, and despite UCSC voting against it, the union ratified it anyway (including a no-strike clause).
Yup, the students joined the union and the union negotiated a contract they didn't like.
Yup, the students joined the union and the union negotiated a contract they didn't like.
Now the students are breaking that contract.