Some movements are slippery and pinning them down is difficult. One author said that the behavior of fascists (how they operate) is more important than what they believe. If Huey Long, George Wallace, Ross Perot, Sarah Palin, Bernie Sanders, and Donald Trump can all be defined as "populists", then apparently what is unique about populists
is how they engage in politics Bernie Sanders and George Wallace are far apart ideologically, but both of them had a mass appeal (just not 'mass' enough to win). They were both 'insurgents'. So was Donald Trump, who did get enough votes (once and never again we hope).
Long, Wallace, and Trump also smelled more than a little like fascists, something I wouldn't say about Perot or Sanders.
The language of "elites" is as screwed up as the language of "class". A sociologist looks at society and sees classes -- working class, middle class, upper class, ruling class, etc. Class is definable by various features (blah blah blah -- you know this, so I won't go on). "Elite" is a familiar adjective when applied to athletes--think gold medal olympians. "Elite" also applies to those who have, guide, and execute power--the Power Elite of money, military, and politics. The power elite is a fraction of the wealthy top class. There may be 5 million people in the wealthiest class, of whom maybe 50,000 compose the power elite. Some of them are technocrats; quite a few of them are extremely successful capitalists; a few of them are politicians (politicians usually come from below the elite classes, but serve the elite if they want to stay in office); some of them are military elite; there are artists who are elite in their field--most of them nowhere near as wealthy as Taylor Swift
The elite class supports both political parties, more or less consistently, but not strictly; they occasionally support counter-cultural movements like the civil rights movement which was bucking the Jim Crow system 70 years ago.
So much of what goes on in society is managed by the power elite directly or indirectly. How much will we give to Ukraine? How much to Israel? Taiwan? How many millions of asylum seekers/border crossers/migrants will we accept? How much will the rich be taxed? How oppressed will the poor be? How much are we going to do, or not do, about global warming? So on and so forth.
The elite are not sitting up there pulling strings; they aren't puppet masters because the masses are not puppets. It's much more a trickle down process, where the stated interests of the elites flow downward from on high through various academic and institutional channels until it reaches the pavement.
It is important to bear in mind that the Elites are not necessarily nice. It may suit them to have someone like Donald Trump stumbling around in the china store; maybe some of them feel that the liberal establishment needs to be braked. One thing IS quite certain -- the ruling class has class consciousness, and they know (in detail) what is good for them. They don't like chaos, loss of control, uncontrolled violence, and so on. They prefer to operate in an orderly society where people do what they are told to do, so up about it, thank you very much.
So, a lot of the discourse about privileged elites, progressives, populists, authoritarians, fascists, and so on is just peripheral chatter.
G. William Domhoff has done extensive research in the American Ruling Class, the power elite, and how it maintains and perpetuates itself. Here is a
YouTubetalk by Domhoff. He did his main research and writing decades ago, but got it right. In his later hears he has turned his attention to neurocognition and dreaming.