More than 400 Hollywood creatives, including director Guillermo del Toro and actors Cynthia Erivo and Joseph Gordon-Levitt, are urging the U.S. government to uphold existing copyright protections against artificial intelligence.

Paul McCartney, Aubrey Plaza, Chris Rock, and hundreds of others signed an open letter to the government, challenging OpenAI and Google. A who’s who of musicians, actors, directors, and more have teamed up to sound the alarm as AI leaders including OpenAI and Google argue that they shouldn’t have to pay copyright holders for AI training material.