In The Means of Production we learned about land, labor, and capital, and how they're considered to be the three things necessary for producing goods and services in an economy. Here I'm going to give a highly simplified overview of how political systems and economic systems intertwine.
There are three main political-economic systems that have existed in the last five hundred years or so, and a particularly nasty one that I'll argue is a subset of one of the three. Each of the three roughly aligns with one of the means of production.
Starting with the most current, there's capitalism, which aligns capital (money) with government.
Aligning labor to government is the purview of the Marxist systems of socialism, communism.
Finally, going back in time, aligning land to government is the realm of feudalism and the time of kings and emperors. The world has mostly decided that feudalism is a no go, but it has popped back up in the form of that nasty one--
Fascism, first used by Mussolini, is a super loaded term, but when viewed from the context of the means of production it becomes a little clearer I think. It is a brand of feudalism where the land of agrarian societies in the pre-industrial era have been replaced by the machines and factories of the industrial era.
In the days of feudalism, the bulk of humanity were slaves or serfs because a large amount of unskilled labor was needed to feed everyone. In the post-industrial feudalism of fascism, there isn't the same need for this large pool of cheap labor.
The question for the fascist is then, what to do with all the people that would have been serfs and slaves.
You can let them stay, and do stuff that doesn't need to be done like building a bunch of buildings in deserts. You can deport them like maga 'merica's doing now. Or you can kill them all.
If you choose the latter, then you're a nazi. And that's why nazis are the worst thing.
Planet Nine is not a political endeavor, but it is an economic one, and as the current thinking on economics is that it is inextricably tied to politics, I find I need to comment briefly on it. The tl;dr though is that I don't think economics and politics are inextricably tied.