Sag-Aftra, the American actors' union, has told their members not to dress up in costumes of characters from movies and television shows this Halloween.
The Screen Actors Guild - American Federation of Television and Radio Artists has issued the advice amid the ongoing actors' strike in the US, which has halted production on many shows and films since it began in July.
The union represents almost 160,000 actors and other media professionals worldwide.
In an infographic posted to their website earlier this week, the union advised their members to not "post photos of costumes inspired by struck content to social media", saying that wearing such costumes would promote content made by the studios the actors are in dispute with.
It instead advises to "choose costumes inspired by generalised characters and figures (ghost, zombie, spider, etc)" or "characters from non-struck content, like an animated TV show."
Deadpool actor Ryan Reynolds commented on the advice on social media platform X, by joking, "I look forward to screaming 'scab' at my 8 year old all night. She's not in the union but she needs to learn."
Other commentators wrote that the measures were "ridiculous" and "silly".
The advice comes a week after the latest negotiations between Hollywood actors and studios broke down and were "suspended".
Last month, the largely concurrent writers' strike came to an end as The Alliance of Motion Picture and Television Producers (AMPTP) struck a deal with Hollywood writers.