The Hostage Heart (1977)

When billionaire industrialist goes into a hospital for a heart operation, some people who claim to be revolutionaries enter the operating room and draw guns and holds the man and the entire surgical staff hostage. They then demand 10 million dollars. The administrator calls the police and the FBI. The police claim jurisdiction over the matter and the man in charge is intent on taking them even if some of the hostages get killed. Eventually they learn that some of the people in hospital are with them.