Something The Avengers did really well (especially during the Emma Peel era) was recognize the connection between conspiracy & affinity group. In almost every episode, some kind of plot is hidden behind a club or association for some particular topic.

In one, a private golf club is cover for terrorist training. In another, model train enthusiasts & senile retired military men are being manipulated by their butlers. We see a mensa-type organization turned via mind control, psychics (twice: first, real ones, then fake)… Cat fanciers get sold collectable collars that cause cats to attack by remote control. We see a ballet school with a lean-in-feminist…