The University of California is seeking a restraining order against more than 10,000 nurses that are threatening to strike next Thursday.
The nurses at five UC hospitals have threatened a walkout, saying that staffing problems are putting patients at risk.
The UC issued a statement Friday saying the Public Employment Relations Board will seek the injunction in San Francisco Superior Court on Tuesday.
UC official Dwaine Duckett said patient safety is being leveraged by the union as a negotiation tactic.
California Nurses Association spokesman Chuck Idelson said the public board is stacked with conservative appointees who are blocking the democratic rights of nurses.
Nurses are also threatening to walk out of three Los Angeles-area hospitals next Thursday.
Copyright 2010 The Associated Press.