I believe the idea is that when the Committee for Public Safety decides something so heinous is about to be passed in (some?) legislature somewhere in the world (a little hazy on what will be actionable), they will fire up the cat-signal and provide updated campaign code to League members to demonstrate solidarity via a "hunger-strike" of sorts "going-dark" protest.

Not sure if the cat signal will be involved in this "final-mile" of the distributed protest action or not.