For the first time in 63 years, Hollywood has a double strike on its hands.

The contract between SAG-AFTRA (the Screen Actors Guild and American Federation of Television and Radio Artists, two guilds that merged in 2012) and AMPTP (American Motion Picture and Television Producers), which represents Hollywood’s studios and production companies, expired at midnight on Wednesday, July 12. SAG-AFTRA’s national board unanimously voted today to order a strike; membership had previously authorized the strike, with nearly 98 percent of voters in favor. Meanwhile, the WGA (Writers Guild of America) has been on strike since May 2.

Like the WGA strike, a SAG-AFTRA strike comes with profound economic consequences. The WGA’s picket lines have already managed to shut down most productions in New York and Los Angeles and across the country as crew members refuse to cross. Since SAG-AFTRA represents 160,000 members — “actors, announcers, broadcast journalists, dancers, DJs, news writers, news editors, program hosts, puppeteers, recording artists, singers, stunt performers, voiceover artists, and other media professionals,” as their website puts it — a strike would have profound effects on many industries. (By contrast, the WGA, which has just entered day 73 of its strike, has around 20,000 members.)

To be clear, a strike doesn’t mean people can’t act at all; it means they cannot perform work for struck companies (which is to say, members of the AMPTP, like Disney and Netflix). Unless specific concessions are made, they can’t promote work for struck companies either. (Yes, their publicists are reportedly panicking.) Major studios, for instance, have been dropping out of Comic-Con rather than have a poor showing with the few actors who might cross the picket line. You likely wouldn’t see actors promoting new movies (like Barbie or Oppenheimer) or walking the red carpet at film festivals; WGA members have already stayed away. And of course, they won’t be on set.