Nearly 5,000 healthcare workers from Providence Health began a strike Friday morning, picketing all eight Providence hospitals in Oregon, after months of contract negotiations between the health system and the Oregon Nurses Association (ONA) union, which is representing the workers.

The strike, which impacts all eight Providence hospitals in the state as well as six women’s clinics, includes nearly 5,000 nurses, and close to 150 physicians and advanced practitioners.

The largest health care strike in Oregon history began early Friday at Providence across the state, as roughly 5,000 frontline health professionals walked off the job.