More than 2,400 Kaiser Permanente psychologists, therapists, social workers and other mental health workers in Southern California began an open-ended strike Monday over increased workloads and staffing shortages that their union said have created a “substandard” system of care.

The union says there is a “broken” system of care at Kaiser, while management claims the union has been “slow walking” the negotiation process.

Psychologists, therapists and other mental health professionals who work for Kaiser Permanente across Southern California went on strike Monday morning, protesting that the healthcare organization had failed to address enduring problems that hamper its mental health care.