There has been some legal decisions in the recent past both in various countries that JW elders etc are indeed agents of the organization. Just because they’re volunteers or don’t have certain rights within the corporation, doesn’t mean they’re not part of it, if you participate in something the corporation organized and you follow within their rules and regulations of such enterprise, you are by definition an agent.
On the other hand, just because you visit a church, doesn’t make you an agent of the church, but once you get into being responsible for running the events, you can be viewed as doing things with either explicit or implicit authorization of the church.
It is how for example RICO cases are pursued in the US, just because you’re not an employee of the mafia, doesn’t mean you’re not functioning as an agent for it nor does it shield them from liability for the requests made by the organization.