Future of Life Institute — campaign: Pause Giant AI Experiments Open Letter (March 2023): called for a 6-month moratorium on training AI systems more powerful than GPT-4. 33,000+ signatories including Yoshua Bengio, Stuart Russell, Steve Wozniak, Elon Musk.

Note: The source text directly confirms the campaign name, date (22 March 2023), the 6-month moratorium call, and the AI systems threshold (GPT-4). The signature count of 33,705 matches the claim's '33,000+' (within reasonable approximation). However, the source text provided does not include the list of specific signatories (Yoshua Bengio, Stuart Russell, Steve Wozniak, Elon Musk). While these individuals are widely documented as signatories of this letter from other sources, the provided excerpt does not verify them. Therefore, the claim is partially confirmed—the core facts about the letter are verified, but the specific signatories cannot be confirmed from this source text alone.