https://defendourjuries.net/savinglives/

I couldn’t find it either. It may have been circulated within legal networks rather than as a public petition.

My guess it’s by either https://defendourjuries.net/ or the Good Law Project. Both of them have great social media accounts that break down what’s going on, what we need to be paying attention to and how to get involved. I recommend their social accounts where they post videos. They break things down very well there.