So it’d have to be very grassroots, right?

Exactly. If there’s a cool local group, join it. If there isn’t, the beauty is that it can start anywhere, like in your workplace or neighborhood. Start talking to people and hanging out with them regularly. Then start organizing and working around small things that make a difference, like litter pickups. From there you can build a greater political consciousness and work together with other groups and build power outside the political system