I’ve formed a union within the industry. The trick is a balance between meeting with workers and security for the OC. In my campaign, we used discord as well to be a space to connect with as many people as possible outside of work. We also used signal for the OC to discuss the actual organizing. NDAs are limited only to the direct work. You can legally talk about workplace issues though. IWGB (UK equivalent to CODE-CWA) aren’t amateurs, they very likely trained the OC on all of this.