Hello ! I saw a post of yours where you said that "the radical feminist -> TERF -> NAZI pipeline is very well documented" I'm looking for things exactly on that subject, do you have receipts and stuff like that ?
The radical feminist to TERF to NAZI pipeline isn't so much a pipeline as they are both sitting in the same sewer called "bioessentialism", which is in and of itself a fascist belief system.
Summary: belief in gender bioessentialism is an open door to being convinced of the authenticity of other forms of bioessentialism like racism and antisemitism and ableism, and the people promoting those things are NAZIs. Many radfems already believe some of this shit, and you can find it on their blogs.
(I'm going to use man/male and woman/female interchangeably a lot here because to a lot of these people, those words mean the same thing)
Bioessentialism is the belief that there are traits about people that govern your behavior and are baked into your genes, your chromosomes, and your hormones.
According to gender/sex bioessentialism, women/females are inherently weaker than men/males and men are inherently more violent than women. Biologically, men can't help but want to dominate women. In "nature", this creates a "natural" hierarchy with men on the top and women on the bottom.
Gender/sex bioessentialists believe there's absolutely nothing we can do to stop men from doing these things, because these behaviors are not a result of someone's upbringing, they are baked into their very being.
(radfems hate this hierarchy, and patriarchs love it, but they both agree it exists and is immutable)
If you are a radical feminists and you believe this, it's basically impossible to not become transphobic. Men are horrible evil monsters! Being trans isn't real, therefore they must be doing it on purpose to "invade women's spaces" and "fetishize female suffering".
Trans people are so hated by bioessentialists because they are defying the natural order, "playing god", and perverting nature. Some radfems are pro-eugenics - quite a lot of them think that trans people deserve death instead of life-saving care, even when they simultaneously view us as mentally ill.
There are some fringe beliefs that come out of this. A few radfems promote "female separatism", that is, entirely separating society into females and males. Some radfems literally want all males to die out, though admittedly this group are a fringe minority of radfems, so they don't really reflect the wider radfem movement. But it's a natural extension of their beliefs.
Bioessentialism is, of course, crap. It's also racist and ableist, among other things. But it produces a hierarchy, and that's what these people want. And that's where the NAZI shit comes in, because NAZIs are also bioessentialists, and they apply it to race and ability and a bunch of other things on top of gender. You know - smart rich abled white men on top, white women just below them, then disabled people and Jews and people of color on the bottom, etc.
Notably, the only people who get to have "real genders" under white fascist bioessentialism are white people. This is why so many of the "gender markers" you'll see transphobes talk about seem really racist: because they are. They define womanhood based on white Eurocentric beauty ideals, and anything that deviates from that is "masculine". It's why white TERFs so often accuse women of color of being "men" - because they're racist! Also, a lot of white radfems are extremely racist towards men of color.
This shit is easy to observe if you go on their blogs - A lot of them will be openly antisemitic on their blogs, especially right now. They will use marginalized women as a front to be openly racist towards men of color, or to be Islamophobic, or antisemitic, etc. They don't actually give a shit about those women though, and will turn right around and falsely identify a woman of color or a Jewish woman as a "man" whenever they feel like it.
A lot of them are fully willing to align themselves with right-wing/ conservative celebrities and politicians if it means advancing their transphobic rhetoric. In the USA, they'll even go so far as to align themselves with the "alt-right", which is the USA's current fascist party. "Well known" radfems have been seen on talk shows with these jerks.
Also, right-wing men love the gender bioessentialism of radical feminism. Women are weak? Men are strong? Hell yeah! Conservatives/ right-wingers/ fascists eat that shit up. They LOVE it. Bioessentialism is literally the core of the patriarchy because it is how they justify the hierarchy of men on top, women on the bottom.
The only difference between men who love the patriarchy and women who are radfems is what they think the solution is: radfems advocate for female-lead cultures or female separatism or male genocide, while the men who love the patriarchy think women would be happier if they all stopped being feminists and accepted their natural position in the hierarchy: on the bottom.
But they both believe in the hierarchy produced by bioessentialism.
Do I have research papers or screenshots? No. But it's not hard to observe this stuff in radfem and terf circles for yourself.