There are many types of unsafe environments. Being prepared for them and having a plan for what to do can help decrease the risk when in a potentially dangerous situation. ASAN's Safety Toolkit provides a comprehensive guide on how to manage abuse/neglect, mental health, dealing with the police, and getting lost. ASAN's Law and Justice page has various toolkits on ensuring that the law is enforced fairly for autistic people. ASAN discusses topics such as gun violence, filicide, and justice.
The U.S. Department of Health and Human Services (HHS) provides various resources for emergency preparedness for people with disabilities including ensuring safety of at-risk populations in an emergency, best practices for local and state governments, and an information center.
The Thinking Person's Guide to Autism has an article titled "Coping With a Crisis When You Have Unreliable or Intermittent Speech." They define what unreliable/intermittent speech is and walk through different steps to take to ensure the best communication possible.
Autistic Self Advocacy Network
HHS
Thinking Person's Guide to Autism