Actors represented by the Hollywood union SAG-AFTRA voted Monday evening to authorize a strike if they don’t agree on a new contract with major studios, streamers and production companies by June 30.

The strike authorization was approved by an overwhelming margin — nearly 98% of the 65,000 members who cast votes.

The guild, which represents over 160,000 screen actors, broadcast journalists, announcers, hosts and stunt performers, begins its negotiations with the Alliance of Motion Picture and Television Producers on Wedn …