It's had numerous names over the years. Deep state, permanent state, new world order, military industrial complex, oligarchy.....
The meeting at the ironically named Jekyll Island and the subsequent electing of Woodrow Wilson is worth reading as is the failed coup in 1934 when their proposed figurehead, Marine General Smedley Butler blew the whistle on them.
Eisenhower was probably the first to bring their presence to the fore in his fairwell address to the nation.