A group of eight major daily newspapers including the Chicago Tribune and the New York Daily News sued OpenAI and Microsoft on Tuesday, joining the backlash to artificial intelligence companies that have used copyrighted work to train their algorithms without compensating content owners.

The publications were joined by South Florida’s Sun Sentinel; the Denver Post; the Orange County (Calif.) Register; San Jose Mercury News; Orlando Sentinel and St. Paul Pioneer Press in the lawsuit, which alleges that OpenAI and Microsoft used their news articles to train and run their AI tools, including OpenAI’s ChatGPT. All eight newspapers are owned by New York City-based hedge fund Alden Global Capital.