Actors and actresses in several US cities have joined screenwriters in their strike, walking off the job indefinitely.
On Friday, in cities including Los Angeles and New York, actors joined screenwriters who have been on strike since early May.
They braved scorching temperatures to protest in front of movie studios and the headquarters of broadcasting services and television stations.
Stars like Susan Sarandon and Jason Sudeikis were among those protesting.
It is the first time since 1960 that actors and screenwriters have protested together.
The actors' union SAG-AFTRA is demanding better pay for its members and regulations on the use of artificial intelligence.
The actors' strike was officially called on Thursday after no agreement was reached with the Association of Film and TV Studios (AMPTP) despite weeks of negotiations.
With a few exceptions, all filming with actors and actresses would now have to stop, SAG-AFTRA said.
According to the American media, the shooting of films and series is already practically at a standstill.
In addition, union members are not allowed to undertake any work behind the camera or promote their films and series through publicity appearances and interviews.
The union said it planned to strictly control these conditions.
Filming on several films was suspended on Friday, including "Deadpool 3", the sequel to "Gladiator" and the eighth edition of "Mission: Impossible".
However, it is likely to be some time before moviegoers notice the effects of the strikes, as most of the blockbusters for this year have already been shot.