The book "48 Laws of Power" contains the exact answer for how you deal with fascists. It's rule 15:
Some people can be considered to be a “Dangerous Enemy”, and that if you do not vanquish the enemy totally that it will regroup, strong and better, and continue to attack you. Do not assume that everyone thinks, acts or behaves as you do. There are many kinds of people “out there” and some are very, very dangerous. Take no chances.
Crush your enemy totally. Don’t go halfway with them or give them any options whatsoever. If you leave even one ember smoldering, it will eventually ignite. You can’t afford to be lenient.
Kill or be killed. It’s the law of the jungle.
Fascism starts out as a fringe movement like as rule 15 says an ember smoldering, the flames spread and they grow until one day you wake up to a forest fire that has engulfed your country and left it in ruin.
That's why I'm calling on you to a fire extinguisher for fascists. Put them out with everything you got. The earlier you do it, the easier it will be.
I'll admit I don't have all the answers on what you can do about fascism and far-right extremists but I have a few suggestions:
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Call it out and don't tolerate it. Don't put up with fascist friends. I highly recommend reading the Nazi bar story.
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Ensure your dollars don't fund fascism. Boycott companies that enable or contribute to far-right extremists political parties. In particular I'd strongly recommend boycotting Twitter and Tesla and urging as many people to do likewise. Also try to reduce your fossil fuel usage however way you can.
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Get to the root cause of why people turn to fascism and work to fix the societal and political causes for people turning to fascism. For example people feel left behind and the extremely wealthy are accumulating more power while some are barely getting by despite working hard everyday. The extremely wealthy realize what's happening and realize soon people will call for change so they create a scapegoat so people won't realize it's them who are really the cause of their problems. The solution is to ensure that people have their needs met, things like good healthcare, access to affordable nutritious food, good paying jobs.
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Advocate for better education, teach people how to stop fascism and why it's bad, give people good media literacy, emotional resilience and intelligence, and classes designed to teach people how to recognize manipulation.
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Advocate for laws banning fascism, ban things like overt hate speech, discrimination and far-right political parties that threaten your country. If laws are already on the books but are not being enforced demand enforcement of existing laws. I'd highly recommend reading about the Lapua Movement. The key reasons it was stopped was because people united against it and because judges banned it and imposed harsh penalties on those who were involved. This is why MAGA is trying to undermine our judicial system right now.
It can happen to anyone, even an Australian police officer who married a man in the army.
https://www.news.com.au/travel/travel-updates/incidents/terrified-excop-jailed-and-deported-during-holiday-to-us/news-story/f48a5e5f7337df29dcd3679336bf6031