That’s the Exclusive Brethren (or closed Brethren), a very strange bunch. Not sure if they still do it but they used to build churches with no external windows so people couldn’t look in. You also could not just walk in off the street, they close the doors on outsiders. They used to have a shop in Burnie (Tassie) when I lived there and the only person you could talk to was the guy manning the register, no one else would even look at you and if you tried talking to them they would quickly go out the back, especially the women.
Then you have the open Brethren, essentially just another protestant church but with the different concept that they had no pastor or lead minister. They operated under the principle off having a group of elders who ran the place not just one man. In principle not a bad idea, in a practical sense there was always one alpha male that made the decisions when it needed one voice. Senior Elder is what he was called. They are similar to Baptists and our church worked closely with them. Nothing like the Exclusive nutters though, just a similar name. Actually a guy I used to know and spent some time with became a pollie, he was brethren (the open one, not the nutters). Classic pollie and well suited to becoming one. Some of you would know of him (Brett Whiteley). And no I would not have voted for him if I was still there.