No, they are not a single entity. No they aren't perfectly coordinated. No, they aren't a single group conspiring in a smokey room.
But they are a social group. They go to the same schools, live in the same ZIP codes and vacation in similar places. They marry overwhelming among themselves. There are a few thousand families in the US with that level of power. New families reach these power levels and other families fall off, it isn't a fixed thing.
But you'll know who they are because you and I aren't invited to their clubs.