After Mayor Bill de Blasio’s announcement of a vaccine mandate for city workers, police union heads say they will take legal actions to oppose the mandate and protect the rights of their employees. On Wednesday, de Blasio said any city worker who is not vaccinated with at least the first dose of the vaccine by 5 p.m. on Oct. 29 will be put on unpaid leave, prompting police unions to fight back. Police Benevolent Association President Patrick J. Lynch said in a statement Thursday that his organization will go to court to protect his employees’ right to make their own medical decisions.