LOS ANGELES The union that represents film actors told its members Thursday not to work on the upcoming pandemic thriller Songbird, saying the filmmakers have not been up-front about safety measures and had not signed the proper agreements for the movie that is among the first in production after coronavirus closures. Actors had reportedly been rehearsing remotely for the film produced by Michael Bay and directed by Adam Mason. "Also, as noted in the Do Not Work order, the producers have not yet become signatory to our agreement. We have no further comment.The small film was among the first to attempt to resume production after the long closure. One of the companies, Invisible Narrative, told Deadline, We are actively working to resolve this paperwork issue with the guild.