NEW YORK - CNN has fired three employees who violated company policy by coming to work unvaccinated against the COVID-19 virus. CNN chief Jeff Zucker told staff members of the firing in a memo sent Thursday that reminded them that vaccines were mandatory if they report to the office or out in the field where they come into contact with other employees. "Let me be clear - we have a zero tolerance policy on this," wrote Zucker, chairman of news and sports for WarnerMedia. The memo was obtained by The Associated Press after its contents were first tweeted by CNN...