Their union, University Professional and Technical Workers, says the action is in response to a systemwide hiring freeze imposed by the UC in March, a move the union contends is exacerbating a staffing crisis in the system.
The UPTE has been engaged in contract talks with the university, and the union staged a three-day statewide strike in February.
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"What we're really asking is for the university to engage fairly with our proposals," said Julia Mangione, a research associate at UC Irvine.
City News Service contributed to this report.