Novel applications of artificial intelligence can endanger people in new ways. As AI is integrated into new parts of our lives, we must keep safety and security in the development and maintenance of AI systems top of mind. Last year at Data & Society, we convened experts from a number of fields, including cybersecurity, machine learning, computer science, political science, national security, activism, and advocacy, to conceptualize the greatest opportunities and challenges to building safe and secure socio-technical systems. Among our most significant findings was a rift between what it means to make something "safe" and make something "secure." Safety and security have different valences for different communities.