walked off the job Monday night in the entertainment industry’s first strike in 15 years, after the union and the Alliance of Motion Picture and Television Producers failed to reach a deal.WGA said the decision to strike was made after six weeks of negotiations with the umbrella organization that is representing Netflix, Amazon, Apple, Disney, Discovery-Warner, NBC Universal, Paramount and Sony. But it’s the studios themselves where writers and supporters will carry signs and march. Picketing it set to take place from 1 p.m.