Kaiser Permanente nurses and health care workers are set to walk off the job today as a contract dispute intensifies. Union officials say the strike begins at 7 a.m. and will continue until Kaiser agrees to changes they say are needed to protect patients and frontline caregivers. Workers point to staffing shortages, access to care issues, and pay concerns as driving forces behind the walkout. The union has also filed a labor complaint with federal regulators, accusing Kaiser of unfair practices.