LOS ANGELES (AP) — Hollywood’s actors’ union filed an unfair labor practice charge against Llama Productions on Monday, alleging the company replaced actors’ work by using artificial intelligence to generate Darth Vader’s voice in Fortnite without notice.

Epic Games and Llama Productions are the subject of an unfair labour practice charge from the SAG-AFTRA union.

The union that represents U.S. actors, journalists and other artists has filed an Unfair Labor Practices complaint against the production company for the popular interactive video game, Fortnite.