A majority of the nurses at UPMC Magee-Womens Hospital have voted to unionize.
The vote to join SEIU Healthcare Pennsylvania was 402-305.
Nurses, elected officials, patients, and community members are expected to gather Tuesday to call on UPMC executives to negotiate a union contract.
In a statement, UPMC said it respects the decision of the nurses to unionize and looks forward to building a respectful partnership.